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Detection of oestrus is a key determinant of profitability of dairy herds, but is increasingly difficult to observe in the modern dairy cow, with shorter duration and less intense oestrus. Current trends in the dairy industry also exacerbate the problem of poor oestrous detection as herd sizes are increasing, yet there is less labour on the farm. As a consequence fewer cows are seen standing to be mounted, the definite sign that a cow is in oestrus. Concurrent with the unfavourable correlation between milk yield and fertility, oestrous detection rates have declined to less than 50%. Although visual detection of oestrus is accurate, it can be time consuming and inefficient. In response to these constraints and poor oestrous detection rates automated methods of detection are currently employed although they are lacking in accuracy and efficiency. The current work investigated possible risk factors among the herd for decreased oestrous expression, measured by activity monitors (Lely-HR Tags), with emphasis on individual cow factors affecting the activity increase at oestrus (n=205 cows). A novel approach was also tested, Ultra-wide band (UWB) technology (Thales Research Technology, UK) for proof of concept that oestrus, mounting and standing to be mounted, could be detected in dairy cows (initial validation studies plus 2 week long trials, n=16 cows; 8 in each). Several parameters were investigated for their association with maximum activity increase at oestrus using generalised linear mixed models. Activity increases at oestrus between 2 and 4 fold. Various influential factors that affect the activity increase were reported in this study: parity, successive oestrous number post partum and milk yield are inversely related to the activity increase at oestrus and activity increases were affected by time of year for each oestrus event (P<0.05). In addition, larger activity increases at oestrus were not related to an increased probability of conception. The three dimensional position of 12 cows, with their oestrous cycles synchronized, and 4 pregnant control cows were monitored continuously, using UWB mobile units (MU) operating within a base unit (BU) network for a period of 7 days. Cow position was reported twice per second in real-time with this system. In the complete study 10 cows came into oestrus as confirmed by simultaneous visual observation & CCTV recording, activity monitoring (Lely-HR Tags) and by analysis of milk progesterone concentration. Raw data taken from the UWB system were then analysed post trial to determine whether oestrus could be detected; including elevations in cow height and cow interactions. Furthermore, automated software was developed and script analysis (MatLab R2012b, The MathWorks, Inc., US) was carried out to detect cows in oestrus, reporting the time of oestrus onset in real-time. UWB accurately confirmed oestrus in 9 out of 10 cows in oestrus as confirmed by real-time video recording and continuous visual observation of activity. Although due to the constraints of the script 1 cow could not be detected in oestrus by UWB as she was the only cow in oestrus at the time equipped with a MU. Further confirmation of oestrus was carried out by physiological measurements; increases in activity on the day of oestrus and low progesterone concentrations <1ng/ml. In addition, UWB accurately confirmed 6 out of 6 cows as not being in oestrus. In conclusion UWB accurately detected cows in oestrus. Furthermore, automated detection by UWB enables the identification of the onset of oestrus, mounting, and when cows are in oestrus and first stood to be mounted, in real-time. Therefore UWB is advantageous because knowledge of onset of oestrus allows for accurately timed artificial insemination (AI) coinciding with ovulation, in order to increase conception rates. In summary, variables that affect expression of oestrus have been identified by this work. This would allow for identification of cows prone to decreased oestrous expression. In addition UWB accurately detected oestrus when cows displayed mounting and standing to be mounted behaviour. This work has shown ‘proof of concept’ that with further development UWB could be used as a novel automated method of oestrous detection. Therefore the current work has provided knowledge on factors that influence oestrous expression and possible solutions to the permanent improvement of detection. The work also provides evidence of a novel technology that can be developed in order to increase oestrous detection rates.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • AERTS, J. M. & BOLS, P. E. (2010) Ovarian follicular dynamics. A review with emphasis on the bovine species. Part II: Antral development, exogenous influence and future prospects. Reprod. Domest. Anim., 45, 180-7.
    • AHMADI, A. & NG, S. C. (1999) Fertilizing ability of DNA-damaged spermatozoa. J. Exp. Zool., 284, 696-704.
    • AKOZ, M., AYDIN, I. & ALI, D. D. (2008) Efficacy of the Presynch-Ovsynch Program on Some Reproductive Parameters in Postpartum Dairy Cows. Acta Vet. (Beogr.), 58, 477-486.
    • ALILA, H. W. & HANSEL, W. (1984) Origin of different cell types in the bovine corpus luteum as characterized by specific monoclonal antibodies. Biol. Reprod., 31, 1015-1025.
    • ALLRICH, R. D. (1994) Endocrine and neural control of estrus in dairy cows. J. Dairy Sci., 77, 2738-44.
    • ARNEY, D. R., KITWOOD, S. E. & PHILLIPS, C. J. C. (1994) The Increase in Activity during Estrus in Dairy-Cows. Appl. Anim. Behav. Sci., 40, 211-218.
    • AT-TARAS, E. E. & SPAHR, S. L. (2001) Detection and characterization of estrus in dairy cattle with an electronic heatmount detector and an electronic activity tag. J. Dairy Sci., 84, 792-798.
    • BAHAR, B. & SWEENEY, T. (2008) Mapping of the transcription start site (TSS) and identification of SNPs in the bovine neuropeptide Y (NPY) gene. BMC Genet., 9, 91.
    • BALL, P. J. H. & PETERS, A. R. (2004) Reproduction in Cattle, Oxford, Blackwell.
    • BANOS, G., WOOLLIAMS, J. A., WOODWARD, B. W., FORBES, A. B. & COFFEY, M. P. (2008) Impact of Single Nucleotide Polymorphisms in Leptin, Leptin Receptor, Growth Hormone Receptor, and Diacylglycerol Acyltransferase (DGAT1) Gene Loci on Milk Production, Feed, and Body Energy Traits of UK Dairy Cows. J. Dairy Sci., 91, 3190-3200.
    • BARBAT, A., LE MEZEC, P., DUCROCQ, V., MATTALIA, S., FRITZ, S., BOICHARD, D., PONSART, C. & HUMBLOT, P. (2010) Female fertility in French dairy breeds: current situation and strategies for improvement. J. Reprod. Dev., 56, S15-21.
    • BEERDA, B., WYSZYNSKA-KOKO, J., TE PAS, M. F. W., DE WIT, A. A. C. & VEERKAMP, R. F. (2008) Expression profiles of genes regulating dairy cow fertility: recent findings, ongoing activities and future possibilities. Animal, 2, 1158-1167.
    • BERGLUND, B. (2008) Genetic improvement of dairy cow reproductive performance. Reprod. Dom. Anim., 43, 89-95.
    • BERRY, D. P., BASTIAANSEN, J. W. M., VEERKAMP, R. F., WIJGA, S., WALL, E., BERGLUND, B. & CALUS, M. P. L. (2012) Genome-wide associations for fertility traits in Holstein-Friesian dairy cows using data from experimental research herds in four European countries. Animal, 6, 1206-1215.
    • BLOTT, S., KIM, J. J., MOISIO, S., SCHMIDT-KUNTZEL, A., CORNET, A., BERZI, P., CAMBISANO, N., FORD, C., GRISART, B., JOHNSON, D., KARIM, L., SIMON, P., SNELL, R., SPELMAN, R., WONG, J., VILKKI, J., GEORGES, M., FARNIR, F. & COPPIETERS, W. (2003) Molecular dissection of a quantitative trait locus: a phenylalanine-to-tyrosine substitution in the transmembrane domain of the bovine growth hormone receptor is associated with a major effect on milk yield and composition. Genetics, 163, 253-66.
    • BLOWEY, R. (2005) Factors associated with lameness in dairy cattle. In Practice, 27, 154-162.
    • BOER, H. M. T., VEERKAMP, R. F., BEERDA, B. & WOELDERS, H. (2009) Estrous behavior in dairy cows: identification of underlying mechanisms and gene functions. Animal, 4, 446-453.
    • BOYLE, L. A., MEE, J. F. & KIERNAN, P. J. (2007) The effect of rubber versus concrete passageways in cubicle housing on claw health and reproduction of pluriparous dairy cows. Appl. Anim. Behav. Sci., 106, 1-12.
    • BRACKETT, B. G., OH, Y. K., EVANS, J. F. & DONAWICK, W. J. (1980) Fertilization and Early Development of Cow Ova. Biol. Reprod., 23, 189-205.
    • BRITT, J. H., SCOTT, R. G., ARMSTRONG, J. D. & WHITACRE, M. D. (1986) Determinants of Estrous Behavior in Lactating Holstein Cows. J. Dairy Sci., 69, 2195-2202.
    • BRYM, P., KAMINSKI, S. & WOJCIK, E. (2005) Nucleotide sequence polymorphism within exon 4 of the bovine prolactin gene and its associations with milk performance traits. J. Appl. Genet., 46, 179- 85.
    • BUTLER, W. R. (2003) Energy balance relationships with follicular development, ovulation and fertility in postpartum dairy cows. Livest. Prod. Sci., 83, 211-218.
    • BUTLER, W. R. & SMITH, R. D. (1989) Interrelationships Between Energy Balance and Postpartum Reproductive Function in Dairy Cattle. J. Dairy Sci., 72, 767-783.
    • CAMPBELL, B. K., TELFER, E. E., WEBB, R. & BAIRD, D. T. (2000) Ovarian autografts in sheep as a model for studying folliculogenesis. Mol. Cell. Endocrinol., 163, 131-139.
    • CASTELLANOS, F., GALINA, C. S., ORIHUELA, J. A., NAVARROFIERRO, R. & MONDRAGON, R. (1997) Estrous expression in dairy cows and heifers (Bos taurus) following repeated PGF(2 alpha) injection and choice of selecting a mounting partner. Appl. Anim. Behav. Sci., 51, 29-37.
    • CAVASTANY, D., FERNANDEZ, M., PEREZ, M., TORT, G., SANCHEZ, A. & SIENA, R. (2008) Oestrus behavior in heifers and lactating dairy cows under a pasture-based production system. Vet. Quart., 30, 10-34.
    • CHAGAS, L. M., BASS, J. J., BLACHE, D., BURKE, C. R., KAY, J. K., LINDSAY, D. R., LUCY, M. C., MARTIN, G. B., MEIER, S., RHODES, F. M., ROCHE, J. R., THATCHER, W. W. & WEBB, R. (2007) New perspectives on the roles of nutrition and metabolic priorities in the subfertility of high-producing dairy cows. J. Dairy Sci., 90, 4022- 4032.
    • CHALLAMEL, R., TOME, P., HARMER, D. & BEAUREGARD, S. (2008) Performance assessment of indoor location technologies. Position, Location and Navigation Symposium, 2008 IEEE/ION.
    • CHENAULT, J. R., THATCHER, W. W., KALRA, P. S., ABRAMS, R. M. & WILCOX, C. J. (1975) Transitory Changes in Plasma Progestins, Estradiol, and Luteinizing Hormone Approaching Ovulation in the Bovine. J. Dairy Sci., 58, 709-717.
    • CLAYCOMB, R. W. & DELWICHE, M. J. (1998) Biosensor for on-line measurement of bovine progesterone during milking. Biosens. Bioelectron., 13, 1173-1180.
    • COBANOGLU, O., ZAITOUN, I., CHANG, Y. M., SHOOK, G. E. & KHATIB, H. (2006) Effects of the Signal Transducer and Activator of Transcription 1 (STAT1) Gene on Milk Production Traits in Holstein Dairy Cattle. J. Dairy Sci., 89, 4433-4437. bovine gonadotrophin releasing hormone receptor gene and their associations with fertility. Anim. Genet., 41, 329-331.
    • DEVRIES, T. J., VON KEYSERLINGK, M. A. G. & WEARY, D. M. (2004) Effect of feeding space on the inter-cow distance, aggression, and feeding behavior of free-stall housed lactating dairy cows. J. Dairy Sci., 87, 1432-1438.
    • DISKIN, M. G. (2008) Reproductive management of dairy cows: a review (part I). Ir. Vet. J., 61, 326-332.
    • DISKIN, M. G., AUSTIN, E. J. & ROCHE, J. F. (2002) Exogenous hormonal manipulation of ovarian activity in cattle. Domest. Anim. Endocrinol., 23, 211-28.
    • DISKIN, M. G. & SREENAN, J. M. (2000) Expression and detection of oestrus in cattle. Reprod. Nutr. Develop., 40, 481-491.
    • DOBSON, H., WALKER, S. L., MORRIS, M. J., ROUTLY, J. E. & SMITH, R. F. (2008) Why is it getting more difficult to successfully artificially inseminate dairy cows? Animal, 2, 1104-1111.
    • DONA, G., BURDEN, G. & INGRAM, S. (2009) Combining UWB and GNSS Positioning to Extend Location of Emergency Personnel in Forest Fire Environments. ENC-GNSS 2009, Land and Mobility Applications 2.
    • DRANSFIELD, M. B., NEBEL, R. L., PEARSON, R. E. & WARNICK, L. D. (1998) Timing of insemination for dairy cows identified in estrus by a radiotelemetric estrus detection system. J. Dairy Sci., 81, 1874- 82.
    • EDDY, R. & CLARK, P. (1987) Oestrus prediction in dairy cows using an ELISA progesterone test. Vet. Rec., 120, 31-34.
    • ERB, R. E. & MORRISON, R. A. (1958) Estrus after Conception in a Herd of Holstein-Friesian Cattle1. J. Dairy Sci., 41, 267-274.
    • ESPEY, L. L. (1980) Ovulation as an inflammatory reaction--a hypothesis. Biol. Reprod., 22, 73-106.
    • ESSLEMONT, R. J. (2006) Imagine a world with 100% accurate heat detection - is 4sight the answer? Cattle Practice, 14, 187-192.
    • EVANS, A. C. O. & WALSH, S. W. (2011) The physiology of multifactorial problems limiting the establishment of pregnancy in dairy cattle. Reprod. Fert. Dev., 24, 233-237.
    • EZOV, N., MALTZ, E., YAROM, R., LEWIS, G. S., SCHINDLER, D., RON, M., AIZINBUD, E. & LEHRER, A. R. (1990) Cell-Density, Fluid Volume and Electrolyte Content of Bovine Vulvar Tissue during Estrus and Diestrus. Ani. Reprod. Sci., 22, 281-288.
    • FABRE-NYS, C. & MARTIN, G. B. (1991) Hormonal control of proceptive and receptive sexual behavior and the preovulatory LH surge in the ewe: Reassessment of the respective roles of estradiol, testosterone, and progesterone. Horm. Behav., 25, 295-312.
    • FARRIS, E. J. (1954) Activity of Dairy Cows during Estrus. J. Am. Vet. Med. Assoc., 125, 117-120.
    • FERGUSON, J. D. (1996) Diet, production and reproduction in dairy cows. Anim. Feed Sci. Technol., 59, 173-184.
    • FIRK, R., STAMER, E., JUNGE, W. & KRIETER, J. (2002) Automation of oestrus detection in dairy cows: a review. Livest. Prod. Sci., 75, 219-232.
    • FLAVIN, N., HERIZ, A., MONTEAGUDO, L. V., ENNIS, S., MARTIN, F., BARENDSE, W., ARRUGA, M. V. & ROGERS, M. (1996) Cloning of the bovine activin receptor type II gene (ACVR2) and mapping to chromosome 2 (BTA2). Cytogenet. Cell Genet., 75, 25-9.
    • FLINT, A. P. F., AHMAD, S. & DERECKA, K. (2008) Genetic Selection for Fertility. Cattle Practice, 1-4.
    • FLINT, A. P. F. & SHELDRICK, E. L. (1983) Evidence for a Systemic Role for Ovarian Oxytocin in Luteal Regression in Sheep. J. Reprod. Fert., 67, 215-225.
    • FLINT, A. P. F., WALL, E., COFFEY, M., SIMM, G., BROTHERSTONE, S., STOTT, A.W., SANTAROSSA, J., ROYAL, M.D. AND WOOLIAMS, J.A. (2002) Introducing a UK fertility index. Cattle Practice.
    • FOOTE, R. H. (1975) Estrus Detection and Estrus Detection Aids. J. Dairy Sci., 58, 248-256.
    • FORDE, N., BELTMAN, M. E., LONERGAN, P., DISKIN, M., ROCHE, J. F. & CROWE, M. A. (2011) Oestrous cycles in Bos taurus cattle. Ani. Reprod. Sci., 124, 163-169.
    • FORTUNE, J. E. (1993) Follicular Dynamics during the Bovine Estrous-Cycle - a Limiting Factor in Improvement of Fertility. Ani. Reprod. Sci., 33, 111-125.
    • FORTUNE, J. E. (1994) Ovarian follicular growth and development in mammals. Biol. Reprod., 50, 225-32.
    • FREGONESI, J. A., VEIRA, D. M., VON KEYSERLINGK, M. A. G. & WEARY, D. M. (2007) Effects of Bedding Quality on Lying Behavior of Dairy Cows. J. Dairy Sci., 90, 5468-5472.
    • FRIGGENS, N. C., BJERRING, M., RIDDER, C., HØJSGAARD, S. & LARSEN, T. (2008) Improved Detection of Reproductive Status in Dairy Cows Using Milk Progesterone Measurements. Reprod. Dom. Anim., 43, 113-121.
    • FRIGGENS, N. C. & CHAGUNDA, M. G. G. (2005) Prediction of the reproductive status of cattle on the basis of milk progesterone measures: model description. Theriogenology, 64, 155-190.
    • GALINA, C. S., CALDERON, A. & MCCLOSKEY, M. (1982) Detection of Signs of Estrus in the Charolais Cow and Its Brahman Cross under Continuous Observation. Theriogenology, 17, 485-498.
    • GANGWAR, P. C., BRANTON, C. & EVANS, D. L. (1965) Reproductive and Physiological Responses of Holstein Heifers to Controlled and Natural Climatic Conditions. J. Dairy Sci., 48, 222-&.
    • GARBARINO, E. J., HERNANDEZ, J. A., SHEARER, J. K., RISCO, C. A. & THATCHER, W. W. (2004) Effect of lameness on ovarian activity in postpartum Holstein cows. J. Dairy Sci., 87, 4123-4131.
    • GARNSWORTHY, P. C. (2007) Body condition score in dairy cows: targets for production and fertility. IN GARNSWORTHY, P. C. & WISEMAN, J. (Eds.) Recent advances in animal nutrition. Nottingham, Nottingham University Press.
    • GARNSWORTHY, P. C., SINCLAIR, K. D. & WEBB, R. (2008) Integration of physiological mechanisms that influence fertility in dairy cows. Animal, 2, 1144-1152.
    • GARTLAND, P., SCHIAVO, J., HALL, C. E., FOOTE, R. H. & SCOTT, N. R. (1976) Detection of estrus in dairy cows by electrical measurements of vaginal mucus and by milk progesterone. J. Dairy Sci., 59, 982- 5.
    • GARVERICK, H., BAXTER, G., GONG, J., ARMSTRONG, D., CAMPBELL, B., GUTIERREZ, C. & WEBB, R. (2002) Regulation of expression of ovarian mRNA encoding steroidogenic enzymes and gonadotrophin receptors by FSH and GH in hypogonadotrophic cattle. Reproduction, 123, 651-661.
    • GARVERICK, H. A. (1997) Ovarian Follicular Cysts in Dairy Cows. J. Dairy Sci., 80, 995-1004.
    • GIBBONS, J. R., WILTBANK, M. C. & GINTHER, O. J. (1999) Relationship between follicular development and the decline in the folliclestimulating hormone surge in heifers. Biol. Reprod., 60, 72-7.
    • GINTHER, O. J., KOT, K., KULICK, L. J. & WILTBANK, M. C. (1997) Emergence and deviation of follicles during the development of follicular waves in cattle. Theriogenology, 48, 75-87.
    • GORDON, P. J. (2006) A study on the use of vasectomised bulls as an aid to heat detection in 5 dairy herds. Cattle Practice, 14, 37-39.
    • GUTIERREZ, C. G., GONG, J. G., BRAMLEY, T. A. & WEBB, R. (2006) Selection on predicted breeding value for milk production delays ovulation independently of changes in follicular development, milk production and body weight. Anim. Reprod. Sci., 95, 193-205.
    • GWAZDAUSKAS, F. C., LINEWEAVER, J. A. & MCGILLIARD, M. L. (1983) Environmental and Management Factors Affecting Estrous Activity in Dairy Cattle. J. Dairy Sci., 66, 1510-1514.
    • HACKETT, A. J. & MCALLISTER, A. J. (1984) Onset of Estrus in Dairy-Cows Maintained Indoors Year-Round. J. Dairy Sci., 67, 1793-1797.
    • HALEY, D. B., DE PASSILLE, A. M. & RUSHEN, J. (2001) Assessing cow comfort: effects of two floor types and two tie stall designs on the behaviour of lactating dairy cows. Appl. Anim. Behav. Sci., 71, 105- 117.
    • HALEY, D. B., RUSHEN, J. & DE PASSILLE, A. M. (2000) Behavioural indicators of cow comfort: activity and resting behaviour of dairy cows in two types of housing. Canadian Journal of Animal Science, 80, 257-263.
    • HANSEN, P. J. (1985) Seasonal modulation of puberty and the postpartum anestrus in cattle: A review. Livest. Prod. Sci., 12, 309-327.
    • HANSEN, P. J., KAMWANJA, L. A. & HAUSER, E. R. (1982) The effect of photoperiod on serum concentrations of luteinizing and follicle stimulating hormones in prepubertal heifers following ovariectomy and estradiol injection. Theriogenology, 18, 551-559.
    • HARMER, D. (2004) Ultra Wide-Band (UWB) Indoor Positioning. Thales Research and Technology (UK) Ltd.
    • HARMER, D., RUSSELL, M., FRAZER, E., BAUGE, T., INGRAM, S., SCHMIDT, N., KULL, B., YAROVOY, A., NEZIROVIC, A., XIA, L., DIZDAREVIC, V. & WITRISAL, K. (2008) EUROPCOM: Emergency Ultrawideband RadiO for Positioning and COMmunications. Ultra-Wideband, 2008. ICUWB 2008. IEEE.
    • HARRISON, R. O., FORD, S. P., YOUNG, J. W., CONLEY, A. J. & FREEMAN, A. E. (1990) Increased Milk-Production Versus Reproductive and Energy Status of High Producing Dairy-Cows. J. Dairy Sci., 73, 2749-2758.
    • HASTINGS, N., DONN, S., DERECKA, K., FLINT, A. P. & WOOLLIAMS, J. A. (2006) Polymorphisms within the coding region of the bovine luteinizing hormone receptor gene and their association with fertility traits. Anim. Genet., 37, 583-585.
    • HAYES, B. J., BOWMAN, P. J., CHAMBERLAIN, A. J. & GODDARD, M. E. (2009) Invited review: Genomic selection in dairy cattle: Progress and challenges. J. Dairy Sci., 92, 433-443.
    • HAYHURST, C., SORENSEN, M. K., ROYAL, M. D. & LOVENDAHL, P. (2007) Metabolic regulation in Danish bull calves and the relationship to the fertility of their female offspring. J. Dairy Sci., 90, 3909-3916.
    • HOGLUND, J., GULDBRANDTSEN, B., LUND, M. & SAHANA, G. (2012) Analyzes of genome-wide association follow-up study for calving traits in dairy cattle. BMC Genet., 13, 71.
    • HOLMANN, F. J., BLAKE, R. W. & SHUMWAY, C. R. (1987) EconomicEvaluation of 14 Methods of Estrous Detection. J. Dairy Sci., 70, 186-194.
    • HOPSTER, H., VAN DER WERF, J. T. N. & BLOKHUIS, H. J. (1998) Stress enhanced reduction in peripheral blood lymphocyte numbers in dairy cows during endotoxin-induced mastitis. Vet. Immunol. Immunopathol., 66, 83-97.
    • HUNTER, R. H. F. & GREVE, T. (1997) Could artificial insemination of cattle be more fruitful? Penalties associated with ageing eggs. Reprod. Dom. Anim., 32, 137-141.
    • HUNTER, R. H. F. & WILMUT, I. (1983) The Rate of Functional Sperm Transport into the Oviducts of Mated Cows. Ani. Reprod. Sci., 5, 167-173.
    • HURNIK, J. F., KING, G. J. & ROBERTSON, H. A. (1975) Estrous and related behaviour in postpartum Holstein cows. Appl. Ani. Ethol., 2, 55-68.
    • HUTCHINSON, L. A., FINDLAY, J. K., DE VOS, F. L. & ROBERTSON, D. M. (1987) Effects of bovine inhibin, transforming growth factor-β and bovine activin-A on granulosa cell differentiation. Biochem. Biophys. Res. Commun., 146, 1405-1412.
    • HUZZEY, J. M., DEVRIES, T. J., VALOIS, P. & VON KEYSERLINGK, M. A. G. (2006) Stocking Density and Feed Barrier Design Affect the Feeding and Social Behavior of Dairy Cattle. J. Dairy Sci., 89, 126-133.
    • HUZZEY, J. M., VEIRA, D. M., WEARY, D. M. & VON KEYSERLINGK, M. A. G. (2007) Prepartum Behavior and Dry Matter Intake Identify Dairy Cows at Risk for Metritis. J. Dairy Sci., 90, 3220-3233.
    • IBEAGHA-AWEMU, E., KGWATALALA, P. & ZHAO, X. (2008) A critical analysis of production-associated DNA polymorphisms in the genes of cattle, goat, sheep, and pig. Mamm. Genome, 19, 591-617.
    • ILLUMINA (2011) BovineSNP50.
    • http://www.illumina.com/Documents/products/datasheets/datashee t_bovine_snp5O.pdf.
    • INGRAM, S. (2006) UltraWideBand Indoor Positioning: Indoor positioning to match the best satellite navigation performance. Thales Research and Technology (UK) Ltd.
    • INGRAM, S. J., HARMER, D. & QUINLAN, M. (2004) UltraWideBand indoor positioning systems and their use in emergencies. Position Location and Navigation Symposium, 2004. PLANS 2004.
    • ITO, K., WEARY, D. M. & VON KEYSERLINGK, M. A. G. (2009) Lying behavior: Assessing within- and between-herd variation in freestall-housed dairy cows. J. Dairy Sci., 92, 4412-4420.
    • JENSEN, M. B. (2012) Behaviour around the time of calving in dairy cows. Appl. Anim. Behav. Sci., 139, 195-202.
    • KAMINSKI, S., BRYM, P., RUSC, A., WOJCIK, E., AHMAN, A. & MAGI, R. (2006) Associations between milk performance traits in Holstein cows and 16 candidate SNPs identified by arrayed primer extension (APEX) microarray. Anim. Biotechnol., 17, 1-11.
    • KEMP, M. H., NOLAN, A. M., CRIPPS, P. J. & FITZPATRICK, J. L. (2008) Animal-based measurements of the severity of mastitis in dairy cows. Vet. Rec., 163, 175-179.
    • KERBRAT, S. & DISENHAUS, C. (2004) A proposition for an updated behavioural characterisation of the oestrus period in dairy cows. Appl. Anim. Behav. Sci., 87, 223-238.
    • KHATIB, H., HUANG, W., WANG, X., TRAN, A. H., BINDRIM, A. B., SCHUTZKUS, V., MONSON, R. L. & YANDELL, B. S. (2009) Single gene and gene interaction effects on fertilization and embryonic survival rates in cattle. J. Dairy Sci., 92, 2238-2247.
    • KHATIB, H., MALTECCA, C., MONSON, R. L., SCHUTZKUS, V., WANG, X. & RUTLEDGE, J. J. (2008a) The fibroblast growth factor 2 gene is associated with embryonic mortality in cattle. J. Ani. Sci., 86, 2063- 2067.
    • KHATIB, H., MONSON, R. L., SCHUTZKUS, V., KOHL, D. M., ROSA, G. J. M. & RUTLEDGE, J. J. (2008b) Mutations in the STAT5A gene are LOPEZ-GATIUS, F., SANTOLARIA, P., MUNDET, I. & YANIZ, J. L. (2005) Walking activity at estrus and subsequent fertility in dairy cows. Theriogenology, 63, 1419-29.
    • LOPEZ, H., BUNCH, T. D. & SHIPKA, M. P. (2002) Estrogen concentrations in milk at estrus and ovulation in dairy cows. Anim. Reprod. Sci., 72, 37-46.
    • LOPEZ, H., SATTER, L. D. & WILTBANK, M. C. (2004) Relationship between level of milk production and estrous behavior of lactating dairy cows. Anim. Reprod. Sci., 81, 209-223.
    • LOVENDAHL, P., CHAGUNDA, M., O'CONNELL, J. & FRIGGENS, N. (2008) Genetics of fertility indicators based on behaviour and progesterone in milk. Cattle Practice, 17, 7-12.
    • LOVENDAHL, P. & CHAGUNDA, M. G. G. (2006) Assessment of fertility in dairy cows based on electronic monitoring of their physical activity. 8th World Congress on Genetics Applied to Livestock Production, August 13-18, 2006, Belo Horizonte, MG, Brasil.
    • LOVENDAHL, P. & CHAGUNDA, M. G. G. (2009) Genetic variation in estrus activity traits. J. Dairy Sci., 92, 4683-4688.
    • LOVENDAHL, P. & FRIGGENS, N. (2008) Opportunities for Online Monitoring of Health and Performance in Dairy Cows. Recent Advances in Animal Nutrition, 2008, 15-38.
    • LUCY, M. C. (2001) Reproductive loss in high-producing dairy cattle: where will it end? J. Dairy Sci., 84, 1277-93.
    • LUCY, M. C., MCDOUGALL, S. & NATION, D. P. (2004) The use of hormonal treatments to improve the reproductive performance of lactating dairy cows in feedlot or pasture-based management systems. Anim. Reprod. Sci., 82-83, 495-512.
    • LUCY, M. C., SAVIO, J. D., BADINGA, L., DE LA SOTA, R. L. & THATCHER, W. W. (1992) Factors that affect ovarian follicular dynamics in cattle. J. Anim. Sci., 70, 3615-26.
    • LYIMO, Z. C., NIELEN, M., OUWELTJES, W., KRUIP, T. A. & VAN EERDENBURG, F. J. (2000) Relationship among estradiol, cortisol and intensity of estrous behavior in dairy cattle. Theriogenology, 53, 1783-95.
    • MACKEY, D. R., SREENAN, J. M., ROCHE, J. F. & DISKIN, M. G. (1999) Effect of Acute Nutritional Restriction on Incidence of Anovulation and Periovulatory Estradiol and Gonadotropin Concentrations in Beef Heifers. Biol. Reprod., 61, 1601-1607.
    • MACMILLAN, K. L. (2010) Recent advances in the synchronization of estrus and ovulation in dairy cows. J. Reprod. Dev. Suppl., 56, S42-7.
    • MACMILLAN, K. L. & DAY, A. M. (1982) Prostaglandin-F2-Alpha - a Fertility Drug in Dairy-Cattle. Theriogenology, 18, 245-253.
    • MACMILLAN, K. L., LEAN, I. J. & WESTWOOD, C. T. (1996) The effects of lactation on the fertility of dairy cows. Aust. Vet. J., 73, 141-147.
    • MACMILLAN, K. L. & PETERSON, A. J. (1993) A new intravaginal progesterone releasing device for cattle (CIDR-B) for oestrous synchronisation, increasing pregnancy rates and the treatment of post-partum anoestrus. Anim. Reprod. Sci., 33, 1-25.
    • MAYNE, C. S., MCCOY, M. A., LENNOX, S. D., MACKEY, D. R., VERNER, M., CATNEY, D. C., MCCAUGHEY, W. J., WYLIE, A. R. G., KENNEDY, B. W. & GORDON, F. J. (2002) Fertility of dairy cows in Northern Ireland. Vet. Rec., 150, 707-713.
    • MCARTHUR, A. J., EASDON, M. P. & GREGSON, K. (1992) Milk Temperature and Detection of Estrus in Dairy-Cattle. J. Agric. Engineering Res., 51, 29-46.
    • MEIKLE, A., KULCSAR, M., CHILLIARD, Y., FEBEL, H., DELAVAUD, C., CAVESTANY, D. & CHILIBROSTE, P. (2004) Effects of parity and
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