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Pattern of behavioral, physiological, and performance parameters before insemination in dairy cows that became pregnant or not to first service.

G. E. Granados

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06-23-2020

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Abstract:

T93
Pattern of behavioral, physiological, and performance parameters before insemination in dairy cows that became pregnant or not to first service.
G. E. Granados*, M. M. Perez, J. O. Giordano. Cornell University Ithaca, NY.

The objective of this study was to compare the pattern of behavioral, physiological, and performance parameters before insemination (AI) in dairy cows that became pregnant or not to their first service (FS). Outcomes (PG = pregnant vs. NP = not pregnant) for FS timed AI after a Double-Ovsynch protocol were collected from lactating Holstein cows [609 primiparous (PP) and 1,010 multiparous (MP)]. Parameters collected from cow-attached and non-attached automated sensors were: milk yield (kg), milk fat (%), protein (%), and lactose (%), milk conductivity (mmHo), BW (kg), activity (AU; arbitrary units), resting time (min), eating behavior (AU), rumination behavior (AU), and reticulo-rumen temperature (�C). Daily data from −14 to 56 DIM was averaged for time periods: −14 to −8, −7 to −3, −2 to 2, 3 to 7, 8 to 14, 15 to 28, 29 to 56 DIM and analyzed by parity using ANOVA with repeated measures. Fixed effects were FS outcome with FS season and lactation group (2 vs 3+ for MP only) as confounders. Cow within FS outcome group was the random effect and object of repeated measures. For PP, milk yield (P = 0.03) and temperature (P = 0.04) was greater for all time periods for PG than NP cows. No effect FS outcome group or the group by time interaction (P > 0.10) was observed for milk fat, protein, fat-to-protein ratio, lactose, conductivity, activity, resting time, BW, eating, and rumination. For MP, there was a group by time interaction (P < 0.05) for protein, lactose, temperature, eating, and rumination, a tendency (P < 0.10) for milk yield and fat-to-protein ratio, and no effect (P > 0.10) for fat, conductivity, activity, resting time, and BW. Protein (15 to 56 DIM), lactose (0 to 7 DIM), eating (3 to 7 DIM), and rumination (3 to 7 DIM) were greater for PG than NP and temperature (3 to 28 DIM) was lower for NP than P. We conclude that there are differences in behavioral, physiological, and performance parameters before insemination in lactating dairy cows that become pregnant or not to FS but differences are parity-specific.

Keywords: sensor, pregnancy, dairy cow.