Environmental and genetic factors affecting milk yield and quality in three Italian sheep breeds
Environmental and genetic factors affecting milk yield and quality in three Italian sheep breeds
复制标题
DOI：
10.1017/s0022029916000765
复制
发表时间：
2017-02-01
影响因子：
2.1
通讯作者：
Dario, Cataldo
中科院分区：
文献类型：
--
作者：
Selvaggi, Maria;D'Alessandro, Angela Gabriella;Dario, Cataldo
研究通讯中描述的研究目的是确定一些环境因素对牛奶产量和质量性状的影响程度，包括乳糖和属于三个不同意大利品种的母羊的泌乳时间，并估计相同性状的遗传力。共2138泌乳记录535母羊属于三个不同的意大利品种（Comisana，莱切塞，和萨尔达）。品种显著影响所有考虑的性状。产羔年份影响产奶量和泌乳期，但对乳品质性状无影响。胎次只对产奶量有显著影响，而出生类型对产奶量、脂肪、蛋白质和乳糖产量有影响。总的来说，目前报道的遗传力估计值的范围内已经获得的其他奶牛品种的其他作者，与值的哺乳期长度是非常低的，在所有的调查人口。考虑到乳糖含量和产量的遗传力估计，据我们所知，这些参数在绵羊种属中缺乏信息，这是第一份关于奶牛品种乳糖含量和产量遗传力的报告。我们的研究结果表明，遗传变异的牛奶性状以外的哺乳期长度是足够的选择表明在这些品种的选择反应良好。
The aims of the study described in the Research Communication were to determine the level of influence of some environmental factors on milk yield and quality traits, including lactose, and lactation length in ewes belonging to three different Italian breeds and to estimate the heritability for the same traits. A total of 2138 lactation records obtained from 535 ewes belonging to three different Italian breeds (Comisana, Leccese, and Sarda) were used. Breed significantly affected all of the considered traits. Moreover, year of lambing affected milk yield and lactation length without influence on milk quality traits. Parity affected significantly only the milk yield, whereas type of birth showed its effect on milk yield, fat, protein, and lactose yield. On the whole, the presently reported heritability estimates are within the range of those already obtained in other dairy breeds by other authors, with values for lactation length being very low in all the investigated populations. Considering the heritability estimates for lactose content and yield, to the best of our knowledge, there is a lack of information on these parameters in ovine species and this is the first report on heritability of lactose content and yield in dairy sheep breeds. Our results suggest that genetic variability for milk traits other than lactation length is adequate for selection indicating a good response to selection in these breeds.