Erduran Hakan
Department of Small Ruminant Breeding, Bahri Dağdaş International Agricultural Research Institute, 42020, Konya, Türkiye.
J Dairy Res. 2022 Nov;89(4):397-403. doi: 10.1017/S0022029922000838.
This study is the first report to investigate the relationships between time of parturition and milk productivity and quality, as well as indices related to udder measurements and meteorological variables, in Saanen goats raised under semi-intensive conditions. Goats giving birth in the hours of darkness had higher milk production than those that gave birth in the hours of daylight, while those giving birth during the evening hours had lower somatic cell count (SCC) than those with parturition during the daylight and night hours ( < 0.05). In addition, the time of parturition was associated with rear udder depth, udder circumference, and udder volume traits ( < 0.01). Parity and time of parturition × parity interaction had significant effects on lactation milk yield and lactation length, as well as milk fat, protein, lactose, total solids content and electrical conductivity ( < 0.05 to < 0.01). The lactation stage, daily milk yield level and parity affected milk SCC ( < 0.05). Ambient temperature and daylight length had strong effects on daily milk yield ( < 0.05). These findings have practical implications for productivity, quality and health promotion efforts aimed at increasing Saanen goat dairy productivity consistently in the face of climatic changes in a semi-intensive system.
本研究首次报告了在半集约化条件下饲养的萨能山羊分娩时间与产奶量、奶品质以及与乳房测量和气象变量相关指标之间的关系。在夜间分娩的山羊产奶量高于在白天分娩的山羊，而在傍晚分娩的山羊体细胞计数（SCC）低于在白天和夜间分娩的山羊（P<0.05）。此外，分娩时间与乳房后部深度、乳房周长和乳房容积性状相关（P<0.01）。胎次以及分娩时间×胎次交互作用对泌乳期产奶量、泌乳期长度以及乳脂肪、蛋白质、乳糖、总固体含量和电导率有显著影响（P<0.05至P<0.01）。泌乳阶段、日产奶量水平和胎次影响牛奶SCC（P<0.05）。环境温度和日照长度对日产奶量有显著影响（P<0.05）。这些发现对于在半集约化系统中面对气候变化持续提高萨能山羊奶业生产力的生产效率、奶品质和健康促进工作具有实际意义。
