Daily lying behavior of lactating Holstein cows during an estrus synchronization protocol and its associations with fertility

Objectives were to quantify lying behavior (LB) during an estradiol and progesterone-based synchronization protocol, to assess risk factors for ovulation, pregnancy per AI (P/AI), and degree of behavioral change at estrus, and to investigate the associations between estrus LB and walking activity. H...

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Bibliographic Details
Published in:Journal of dairy science 2017-10, Vol.100 (10), p.8484-8495
Main Authors: Silper, B.F., Madureira, A.M.L., Polsky, L.B., Soriano, S., Sica, A.F., Vasconcelos, J.L.M., Cerri, R.L.A.
Format: Article
Language:English
Subjects:
Animals
automated detection
Cattle
Estradiol
Estrus
estrus intensity
Estrus Synchronization
Female
Fertility
Insemination, Artificial - methods
Insemination, Artificial - veterinary
Lactation
lying behavior
Ovulation
Physical Conditioning, Animal
Posture
Pregnancy
Progesterone
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Summary:Objectives were to quantify lying behavior (LB) during an estradiol and progesterone-based synchronization protocol, to assess risk factors for ovulation, pregnancy per AI (P/AI), and degree of behavioral change at estrus, and to investigate the associations between estrus LB and walking activity. Holstein cows (43.6 ± 11.0 kg of milk/d) were fitted with leg-mounted accelerometers. Total lying time/d (L_time), bout frequency (bout_N), average lying bout duration, and relative increase in walking activity (ACT%) were evaluated for 1,411 timed artificial insemination events. The day with lowest L_time or bout_N among d −2, −1, and 0 (day of timed artificial insemination) determined the day of behavioral estrus. The variables L_time% and bout_N% represent relative ratios between lowest L_time and baseline (d −7), L_time, and lowest bout_N, and baseline (d −7) bout_N, respectively [e.g., (lowest L_time/baseline L_time) × 100]. Correlation coefficients between L_time% and bout_N% and ACT% were −0.38 and −0.31, respectively. Estrus LB change was considered large if
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.2016-12160