Bovine_reproduction

Bovine_reproduction - Bovine reproduction/dairy management...

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Bovine reproduction/dairy management AS 221
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Normal values--cattle Heart rate 60-70/min Respirations 18-36/min Temp 101-102F Ruminations 1-2/min
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Basic cow facts 5 major dairy breeds: Holstein Jersey Guernsey Ayrshire Brown Swiss
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Some basic dairy cow reproductive information Cows reach puberty at ~10 months, usually bred to calve at 22-26 months of age. Estrous cycle 21 days, non-seasonal breeders. Estrus ~18 hours long, ovulation 10-14 hours post-estrus. Gestation period is 9 months (285d) Cow needs to produce a calf to begin lactation.
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Standard lactation period is 305 days. “Dry” period is between end of one lactation and “freshening”, or calving and coming into milk production once more. “Calving interval” =days in milk+ days dry. Ideally, would be close to 365 days.
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AI preferred—allows rapid genetic improvement, eliminates need to keep a bull Heat detection method needed to determine when to breed. Signs of estrus:
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This note was uploaded on 11/30/2009 for the course ANS 221 taught by Professor Newell during the Fall '05 term at Becker College.

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Bovine_reproduction - Bovine reproduction/dairy management...

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