泌乳期不同生理阶段体细胞计数对宰来壁山羊产奶量、乳成分及生长性能的影响

Ahmed Abdelrazek Gabr, Mohamed Ahmed Ibrahim Ahmed, Rasha Abdalla Hawas
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摘要

研究了不同体细胞计数(SCC)等级对泌乳期三个不同生理阶段宰来比公羊和雏鸡产乳性状和生长发育的影响。分析了50只山羊在泌乳高峰、断奶期和会期(50、100和150天)采集的150份奶样。山羊是根据严格的标准选择的,包括相同的年龄,开玩笑的日期,低奶SCC,没有乳房问题。根据羊奶SCC值将山羊分为SCG1(≤315x10 3 cells/mL)、SCG2 (316-335x10 3 cells/mL)和SCG3 (>335 x10 3 cells/mL) 3个等级。结果表明,虽然SCC1类和SCC2类在泌乳不同阶段的SCC和log SCC存在显著差异,但产奶量和成分差异不显著。随着SCC水平的升高,日产奶量显著降低(> 335x10 3细胞/mL),泌乳损失最大。乳成分在不同哺乳期的SCC类别之间也存在显著差异,最高SCC类别的乳成分最高(> 335x10 3个细胞/mL)。随着泌乳期的延长,日产奶量逐渐降低,SCC值逐渐升高。泌乳期母猪体重变化不显著。综上所述,SCC水平> 335x10 3个细胞/mL对泌乳不同阶段宰来比和幼鹿的产奶量和乳成分有显著影响,但对其生长性状无显著影响。这些发现可能有助于奶农管理他们的牛群和优化牛奶产量,以生产高质量的乳制品。
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Impact of Somatic Cell Count on Milk Yield, Milk Composition, and Growth Performance in Zaraibi Goats During Different Physiological Stages of Lactation Period
: The study investigated the effect of different somatic cell count (SCC) classes on milk production traits and growth of Zaraibi does and kids at three distinct physiological stages during lactation. A total of 150 milk samples obtained from 50 goats at milk peak, kids weaning, and meeting periods (days of 50, 100 and 150) were analyzed. The goats were selected based on strict criteria, including the same age, kidding date, low milk SCC, and no udder problems. The goats were divided into three classes based on overall milk SCC values: SCG1 (≤315x10 3 cells/mL), SCG2 (316-335x10 3 cells/mL), and SCG3 (>335 x10 3 cells/mL). The results showed that although there were significant differences between SCC1 and SCC2 classes in SCC and log SCC at different stages of lactation, there were no significant differences in milk production and composition. The daily milk yield decreased significantly with increased SCC level (> 335x10 3 cells/mL), and the highest milk losses were observed. The milk composition followed the same pattern of significant differences among SCC classes during different lactation stages, with the highest values observed in the highest SCC class (> 335x10 3 cells/mL). The daily milk yield decreased gradually with increasing lactation stage, while SCC values increased gradually. The does’ body weight did not change significantly by lactation stage. Overall, the findings suggest that SCC level of > 335x10 3 cells/mL has a significant effect on milk production and composition, but not on growth traits of Zaraibi does’ and kids during different stages of lactation. These findings could be useful for dairy farmers to manage their herds and optimize milk production to produce high-quality dairy products.
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