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Effects of Age, Parity, Season of Calving, and Sire on Milk Yield of Carora Cows in Venezuela1

Effects of Age, Parity, Season of Calving, and Sire on Milk Yield of Carora Cows in Venezuela1,10.3168/jds.S0022-0302(89)79341-3,Journal of Dairy Scie

Effects of Age, Parity, Season of Calving, and Sire on Milk Yield of Carora Cows in Venezuela1   (Citations: 8)
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Age-parity-season of calving, mature equivalent factors were developed for the Carora breed of Venezuela from more than 13,000 244-d milk yield records from the Venezuelan milk recording pro- gram from 1975 to 1986. Age-parity-sea- son interactions with parity-age were most important for young cows and sea- sonal effects most important for old cows. Multiplicative factors were verified as useful to adjust milk yields of Carora and Brown Swiss crossbred cows. Repeatabilifies for mature equivalent ad- justed milk were .47, .36, and .38 be- tween pairs of repeated records through fourth lactation. Heritability of milk in first lactation by REML procedures was 12% based on 44 Carora sires with 14 effective daughters per sire. Small popu- lation size for Carora cattle hinders use- fulness and cost effectiveness of progeny testing as the primary investment in ge- netic gain. Greater potential economy is likely from exploiting the dams of sires genetic pathway.
Journal: Journal of Dairy Science - J DAIRY SCI , vol. 72, no. 8, pp. 2161-2169, 1989
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