The aim of the present study was to use a non-linear regression approach to investigate the relationship between litter birthweight and litter size of five breeds of goat under intensive conditions in a hot arid environment. Litter-size and litter-weight data on 20 117 kids from 13 685 litters representing five breeds, namely Saanen, Toggenburg, French Alpine, Anglo-Nubian and Granadina, were compared to evaluate this relationship. Regardless of breed, birthweight for kids born as twins, triplets and quadruplets was, on average, 92%, 87% and 83%, respectively, of that of singleton kids; litter size accounted for 81% of the variation in litter weight. The coefficient of the power regression differed (P < 0.01) among breeds, with similar slopes for French Alpine, Toggenburg and Saanen goats and a smaller litter-weight increase for every additional fetus in Anglo-Nubian and Granadina goats than in other breeds of goat. These results support the hypothesis that, regardless of parity, litter weight in dairy and Granadina goats increases at a reduced rate with increases in litter size, although the rate of change with the increasing number of fetuses was moderate, as indicated by a power regression of the form y = axb between these variables across age categories and breeds of goat.

中文翻译：

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勘误表：五种山羊基因型的产仔数与产仔数之间的关系

本研究的目的是使用非线性回归方法研究在炎热干旱环境中密集条件下五个品种山羊的产仔数与产仔数之间的关系。比较了来自 13 685 窝代表五个品种（即萨嫩、托根堡、法国高山、盎格鲁-努比亚和格拉纳迪纳）的 20 117 名儿童的窝产仔数和窝重数据，以评估这种关系。无论品种如何，双胞胎、三胞胎和四胞胎出生的孩子的出生体重平均分别是单胎孩子的 92%、87% 和 83%；窝产仔数占窝重变化的 81%。不同品种的功效回归系数不同（P < 0.01），法国阿尔卑斯山的斜率相似，Toggenburg 和 Saanen 山羊，以及与其他品种山羊相比，盎格鲁努比亚山羊和格拉纳迪纳山羊每增加一个胎儿的窝重增加幅度较小。这些结果支持这样的假设，即无论胎次如何，奶山羊和格拉纳迪纳山羊的窝重随着窝产仔数的增加而以降低的速度增加，尽管随着胎儿数量的增加而变化的速度是适中的，如幂回归所示跨年龄类别和山羊品种的这些变量之间的形式 y = axb。