新疆褐牛乳中体细胞数与产奶性状的影响因素分析

doi:10.3864/j.issn.0578-1752.2016.12.019

Abstract

Abstract: 【Objective】The objective of this study was to analyze the non-genetic and co-variable effect factors of somatic cell counts (SCC) and milk production traits of Xinjiang brown cattle, and the results of the study will supply a scientific basis for guidance of improving production performance of Xinjiang brown cattle.【Method】SAS9.2 was used to analyze the effect of herd, parity and lactation month on SCC and milk production traits as well as their regression with each other in 262 Xinjiang brown cattle in two farms. And then, with Excel 2 013 software, 1 510 dairy herd improvement (DHI) records and the SCC deviation values between adjacent two months were used to draw the figures about the distribution of SCC and their regression with milk production traits of Xinjiang brown cattle in two farms, respectively. 【Result】 The herd and parity had an extremely significant effect on somatic cell counts, all of the milk production traits as well (P＜0.01). Lactation month had an extremely significant effect on milk yield and SCC (P＜0.01), had a significant effect on sugar percentages (P＜0.05) while had no effect on other milk components (P＞0.05). Milk yield, fat percentages, protein percentages and sugar percentages decreased following the increase of SCC, while the total dry matters content increased. The interaction effect among herd, parity and lactation month had no effect on SCC（P＞0.05）. The interaction of herd and parity had an extremely significant effect on milk yield and all of the milk components (P＜0.01). The interaction of herd and lactation month had an extremely significant effect on fat percentage and total dry matters content (P＜0.01), had a significant effect on sugar percentages (P＜0.05) while had no effect on other milk components (P＞0.05). The interaction of parity and lactation month had no effect on any trait. According to the figures of lactation curve which appeared regulations on variations of SCC deviation value and milk production traits. As the higher SCC deviation value, the lower mean of milk yield and sugar percentage. SCC difference ranking method can be used to evaluate the production of dairy cow effectively and determine the trend of mastitis. In comparison of the two farms, it was found that the second farm was better than the first farm as its higher milk production and milk components, lower SCC and the better management level. 【Conclusion】 In order to increase the quality and yield of milk, effective measures should be taken, such as improving milking management, hygiene and standard operation of milking facilities. In addition, SCC deviation value between two months could response the healthy condition of dairy cattle effectively, and it will avoid infecting mastitis by controlling the somatic cell counts in cows. Production management level and DHI monitoring production situation should be strengthened in the first farm to control the SCC and avoid recessive mastitis in Xinjiang brown cattle.

Key words: Xinjiang brown cattle, somatic cell counts (SCC), SCC deviation value, milk traits, lactation number, test day

TIAN Yue-zhen, FENG Wen, WANG Ya-chun, HUANG Xi-xia,YU Ying. Analysis of Effect Factors on SCC and Milk Production Traits of Xinjiang Brown Cattle[J].Scientia Agricultura Sinica, 2016, 49(12): 2437-2448.

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