ENVIRONMENTAL FACTORS AFFECTING MILK YIELD IN FRIESIAN COWS IN PUNJAB, PAKISTAN
ENVIRONMENTAL FACTORS AFFECTING MILK YIELD IN FRIESIAN COWS IN PUNJAB, PAKISTAN
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影响巴基斯坦旁遮普省弗里斯兰奶牛产奶量的环境因素
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
R. H. Mirza
中科院分区：
文献类型：
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作者：
K. Javed;M. Afzal;A. Sattar;R. H. Mirza
1984 年至 2001 年间，卡苏尔区 Bhunikey (Pattoki) 牲畜实验站保存的 537 头弗里斯兰奶牛的 823 条生产性能记录数据被用来调查产奶量变化的各种来源。进行了哈维最小二乘分析。产奶量和哺乳期长度的最小二乘平均值分别为 3391.66 ± 137.97 kg 和 278.40 ± 90.17 天。两个性状显着相关，相关系数为0.61（P<0.01）。哺乳期长度和哺乳期次数是产奶量变化的显着来源（P<0.01）。产犊年份和季节对产奶量的影响也显着（P<0.01）。秋季产犊的产奶量最高（3659.48±153.47 kg），湿热季节产犊的产奶量最低（3249.36±151.83 kg）。春季、冬季和干热季节产犊的奶牛产奶量分别为3424.38±188.16、3345.91±140.12和3279.18±201.29公斤。
Data on 823 performance records of 537 Friesian cows maintained at the Livestock Experiment Station Bhunikey (Pattoki) District Kasur during the years from 1984 to 2001 were used to investigate various sources of variation for milk yield. The Harvey’s least squares analysis was carried out. The least squares means for milk yield and lactation length were 3391.66 ± 137.97 kg and 278.40 ± 90.17 days, respectively. The two traits were significantly correlated with each other having a correlation coefficient of 0.61 (P<0.01). Lactation length and lactation number were significant (P<0.01) sources of variation for milk yield. The influence of year and season of calving on milk yield was also significant (P<0.01). The milk yield was the highest (3659.48 ± 153.47 kg) among the cows calving during autumn and the lowest (3249.36 ± 151.83 kg) among those calving during humid hot season. The cows calving during spring, winter and dry hot seasons yielded 3424.38 ± 188.16, 3345.91 ± 140.12 and 3279.18 ± 201.29 kg of milk, respectively.