The influence of milk productivity on longevity of Latvian Brown cow breed | Latvijas brūnās šķirnes govju piena produktivitātes ietekme uz to ilgmūžību
2014
Cielava, L., Latvia Univ. of Agriculture, Jelgava (Latvia). Inst. of Agrobiotechnology | Jonkus, D., Latvia Univ. of Agriculture, Jelgava (Latvia). Inst. of Agrobiotechnology | Paura, L., Latvia Univ. of Agriculture, Jelgava (Latvia). Dept. of Control Systems
One of most important traits in dairy farming is cow longevity. In last few years length of productive life in Latvian dairy cow population has significantly decreased. Longevity is mostly economic trait: the longer a cow lives, the larger amount of productivity and money farmers gain. Cow longevity depends on a large amount of genetic and non-genetic factors. It is important to find out how each of those factors affects the length of productive life to get rid of negative effects of those factors. The largest cow population in Latvia is considered to be the Latvian brown (LB) cow. For the research purposes 341201 closed lactations were analysed. The analysed cows were born in the period from 2002 to 2006 and they had had at least one closed lactation. Overall, the data about 341183 closed lactations were analyzed. The largest milk yield occurred for cows who were born in 2006, but for cows, born in 2000, average milk yield was 5000 kg. A similar situation was with productivity in different lactations – the largest milk yields were received in the 4th – 5th lactation, but in the 1st lactation milk yield was lower. Average productive life in Latvian brown cattle population is 2.74 lactations and average productivity is 5227.1 kg milk in lactation. Significantly longer life was for cows with milk yields less than 5000 kg in the first lactation, but cows with milk yield over 7500 kg in the first lactation were culled sooner.
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