02-Lactating cow

02-Lactating cow - Lactating Cows Lactating Cows Only species where we measure individual animal performance on a daily basis Terms Terms calving

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1 Lactating Cows Lactating Cows Only species where we measure individual animal performance on a daily basis. Terms calving freshens or freshening parturition Terms lactation number parity primiparous multiparous DHI or DHIA rBST or BST Terms lactating dry cow heifer or 1 st calf heifer bred or serviced calving interval culled Born Bred 1 or more times Pregnant Dry Calves Bred 1 or more times Pregnant Culled Lactation Cycle
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2 Reporting a cow’s production 305-2X-ME lactation record Why 305 days? 305 day lactation +60 day dry period 365 days (a calf a cow a year) Records > 305 days cut back to 305 days Records < 305 days are reported as actual number of days e.g. 289 DIM Optimum length of a lactation Is a 305 day lactation ideal today? Optimum lactation What is the most profitable calving interval? Optimum lactation What is the most profitable calving interval? What about use of rBST? Optimum lactation What is the most profitable calving interval? What about use of rBST? What about shortened dry periods?
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3 Times milked per day Cows milked 3X daily produce 12-18% more milk than cows milked 2X daily Mature equivalent Adjusts lactation record or production for. ... age of the animal when she calved season of year (month) when she calved geographic location (state) where she calved Iowa DHI averages by breed – 2010 (FYI) Ayr B S Gue Hol Jer All herds No. herds 13 30 10 625 33 754 Milk (lb) 17,746 19,071 17,351 24,030 16,431 23,250 E C M (lb)
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This note was uploaded on 02/14/2012 for the course ANS 235 taught by Professor Kilmer during the Fall '08 term at Iowa State.

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02-Lactating cow - Lactating Cows Lactating Cows Only species where we measure individual animal performance on a daily basis Terms Terms calving

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