初产母牛和多产母牛泌乳早期体细胞数评估

S. A. Guamán-Rivera, Á. E. Guerrero-Pincay, N. R. Ortiz-Naveda, R. L. González-Marcillo, Robison J. Herrera-Feijoo
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摘要

一项研究利用阉牛研究了体细胞数(SCC)与产奶量之间的关系。在这项研究中,有 150 头克里奥尔种 Gyr lechers 奶牛(初产妇,PM, 75 和多产妇,MP, 75)参加了研究,它们处于泌乳早期(产奶天数,PM = 134 ± 3;MP = 136 ± 5),产奶量(平均 9.88 千克/天)。在分配到每种处理之前,SCC 值平均低于 220,000 cells/mL。所有奶牛每天自由采食Megathyrs maximus,并补充Morus alba,每天7:00人工挤奶。分析前,对 SCC 进行对数变换(log10)。然后使用 SAS 9.4 版的 PROC Mixed 对所有测量值进行评估。结果显示,MP 奶牛的产奶量高于 PM 奶牛(10.83 vs. 9.18 ± 0.38 kg/d;P = 0.003)。脂肪校正牛奶也观察到类似的结果(8.26 vs. 6.80 ± 0.34;P = 0.002),尽管两组之间的脂肪值没有差异(P = 0.86),都低于这些品种的参考值(平均为 2.46 ± 0.16)。其他牛奶成分也没有发现差异(P = 0.65 至 0.85)。尽管如此,体细胞计数(SCC)值在统计学上显示,PM 比 MP 更接近(1.89 对 2.13 ± 0.05;P = 0.07)。总之,两个组的脂肪含量都很低,这可能是由于反刍动物饲养中使用的食物质量不高。同时,奇数胎次和泌乳晚期对 SCC 含量也有影响。因此,应开展其他研究以确定更多可能的决定因素。关键词牛奶 热带家畜 乳房健康
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Somatic Cell Count Evaluation in Early Lactation between Primiparous and Multiparous Bos indicus Cows
Using Bos indicus cows, a study examined the relationship between somatic cell count (SCC) and milk yield. For this study, one hundred fifty cows (Primiparous, PM, 75 and Multiparous, MP 75) in early lactation (days in milk, PM =134 ± 3; MP = 136 ± 5), milk production (9,88 kg/d, on average) of the creole breed Gyr lechers were enrolled. Before being assigned to each treatment, the SCC values were lower than 220,000 cells/mL, on average. All cows were maintained to graze daily on Megathyrsus maximus and supplemented with Morus alba ad libitum, being hand-milking at 0700 daily. Before analysis, the SCC was logarithmically transformed (log10). Then, PROC Mixed from SAS version 9.4 was used to evaluate all measurements. Regarding our results, the MP had greater milk yields than PM cows (10.83 vs. 9.18 ± 0.38 kg/d; P = 0.003). Similar results were observed for fat-corrected milk (8.26 vs. 6.80 ± 0.34; P = 0.002), although the fat values did not differ between both groups (P = 0.86) being lower than referential values for these breeds (2.46 ± 0.16, on average). No differences were observed in the other milk components (P = 0.65 to 0.85). Despite that, the somatic cell count (SCC) values showed a statistical tendency in PM than in MP (1.89 vs. 2.13 ± 0.05; P = 0.07). In conclusion, low-fat contents were observed in both groups, possibly due to the low quality of foods used in ruminant feeding. While that, the parity and advanced lactation conditioned the SCC contents. Therefore, other studies should be performed to identify more factors that could be determinants. Keywords: Milk, Tropical livestock, Udder health
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