The relationships of cow udder conformation traits with their longevity in voluntary milking system | Tesmeņa pazīmju lineārā vērtējuma sakarība ar govju ilgmūžību brīvprātīgās slaukšanas sistēmā
2018
Cielava, L., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture | Jonkus, D., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture | Zeverte-Rivza, S., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Economics and Social Development | Rivza, B., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Economics and Social Development
As one of the main challenges in dairy farming is to ensure the economic benefit from single cow, it is important to find out the relationships between those factors and cow longevity traits. The aim of our study was to evaluate the relationships between different udder conformation traits and cow longevity in voluntary milking system. Data about 112 culled Holstein Black and White breed cows of LLU Research and Study Farm “Vecauce” voluntary milking system group was included in the study. Data was collected from the “Agricultural Data Centre”. In the analysed group, the average lifespan was 1824.2±52.06 days in which 30317.9±1280.25 kg milk was obtained. The udder conformation traits that showed significant (p is less than 0.05) impact on cow longevity traits were udder depth, fore udder attachment, as well as rear teat placement and teat length. Cows that characterized with the teat length and rear teat placement optimal evaluation scores, had significantly (p is less than 0.05) shorter lifespan than cows with longer and widely positioned teat (1790.9±61.48 and 1794.6±91.80 days, accordingly). Cows with rear teat placement and teat length evaluated with 6–9 linear score points characterized with significantly higher lifetime and life day milk yield (31120.2±2530.73 kg and 16.3±0.79 kg in rear teat placement group and 33043.2±2236.81 kg and 16.7±0.58 kg in teat length group). The udder that is positioned closer to cows body showed positive impact not only on cow lifespan, but also on their lifetime and life day milk yield.
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