Longevity of high-yielding cows
2009
Novakovic, Z. | Aleksic, S. | Sretenovic, Lj., Institute for Animal Husbandry, Belgrade - Zemun (Serbia) | Petrovic, M.M., Ministry of Agriculture, Forestry and Water Management, Belgrade (Serbia) | Pantelic, V. | Ostojic-Andric, D., Institute for Animal Husbandry, Belgrade - Zemun (Serbia)
Objective of this paper was to investigate using appropriate methodology the longevity of high yielding Black and White cows of different genotypes through major systematic influences. Investigated cows according to their origin belong to European type of Black and White cattle in final stage of intensive improvement using Holstein-Friesian breed. Investigated sample included 331 cows. Average age of cows at culling is 2265+/-463.26 days or 6.21+/-1.27 years. Observed by cow genotypes, mean values varied from 2140.99 days (greater than 73% HF), 2247.51 days (58-73% HF) to 2406.97 days (less than 58% HF). Average lifetime production was realized at the level of 25002.66+/-7755.39 kg of milk with 3.61+/-0.01% of milk fat. Bulls, sires of cows, class of HF genes and year of culling had highly significant effect, whereas the effect of reason for culling was significant for life duration of cows.
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