Milk performance of three generations of Simmental cows over whole lactations | Mlečnost tri generacije krava Simentalske rase u celim laktacijama
2012
Petrović, M., Agronomski fakultet, Čačak (Serbia) | Bogosavljević-Bošković, S., Agronomski fakultet, Čačak (Serbia) | Bogdanović, V., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Petrović, M.M., Institut za stočarstvo, Beograd - Zemun (Serbia) | Rakonjac, S., Agronomski fakultet, Čačak (Serbia)
The phenotypic expression and variability of whole lactation production traits across three generations were evaluated in a total of 7535 Simmental cows, with milk performance in granddam, dam and daughter generations being studied in 2305, 2425 and 2805 cows, respectively. The total number of lactations analyzed was 20895, i.e. 4950 in the granddam generation, 6223 in the dam generation and 9722 lactations in the daughter generation. The whole lactation period was about 8 days longer in daughters, lasting 303 days. Milk, milk fat and 4% FCM production showed a decreasing trend across generations, being respectively 4184 kg, 160 kg and 4079 kg in the granddam generation, 4157 kg, 159 kg and 4047 kg in the dam generation and 4015 kg, 153 kg and 3898 kg in the daughter generation. The decrease in milk production across generations is attributed to the fact that dams and, particularly, granddams were either foreign cows which performed under better rearing conditions in Western Europe (Germany, Austria, Switzerland) or their close descendants, as opposed to daughter cows performing under considerably worse feeding and environmental conditions in Serbia, most notably during the 1990s.
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