摘要
Bianca di Saluzzo (BS) and Bionda Piemontese (BP) are two Italian chicken breeds, mainly reared for meat production, primarily in antibiotic-free farming. However, technical information on their growth pattern is still missing. At hatching, 150 unsexed chicks of each breed were weighed, labeled, and reared in indoor pens up to 8 w of age. At 8 w of age, the chicks were separated by sex and randomly transferred to growing pens with access to an external paddock (15 birds/pen; 4 pens/sex for each breed). The body weight (BW) was recorded biweekly for each bird, from hatching to 32 w of age. In order to identify an improvement strategy, the objectives of our study were to analyze the growth pattern of these birds using the Gompertz mathematical model and compare results with other chicken breeds. Polymorphism of the PAX7 gene was also analyzed to test its association with growth traits. Both BS and BP are close to unselected native breeds and, among the Italian local poultry, they are confirmed to be slow-growing birds with an intermediate size between heavy and light chicken breeds. Regarding the PAX7 gene, two alleles were found, F and G, and showed an association with the actual BW in the BP females from 14 w of age onwards. The G allele always exhibited a more favorable effect than the F allele. In small size poultry population, a delicate balance between preservation of biodiversity and performance improvement should be considered. Consequently, the most proper way could be an approach based on a mating scheme to keep inbreeding under control, increase growth rate, and improve commercial maturity.
摘要译文
Bianca di Saluzzo（BS）和Bionda Piemontese（BP）是两种意大利鸡品种，主要饲养肉类生产，主要是在无抗生素的耕种中。但是，关于其增长模式的技术信息仍然缺失。在孵化中，称重，标记为150个每种品种的小鸡，并饲养在室内钢笔最多8瓦。在8岁的时候，雏鸡被性别分开，随机转移到带有外部围场的沟（15只鸟/笔;每种品种的4个钢笔/性别）。对于每只鸟来说，体重（BW）为每只鸟类拍摄，从孵化到32瓦。为了确定改进策略，我们的研究目标是使用Gompertz数学模型分析这些鸟类的生长模式，并与其他鸡品种进行比较结果。还分析了PAX7基因的多态性，以测试其与生长性状的关系。 BS和BP均接近未选择的本地品种，并且在意大利当地家禽中，他们被证实是生长缓慢的鸟类，中间大小在沉重和轻微的鸡肉品种之间。关于PAX7基因，发现了两种等位基因，F和G，并与BP女性中的实际BW与14瓦以来的BP雌性的关系相关联。 g等位基因总是比F等位基因更有利的效果。在小尺寸的家禽人口中，应考虑保存生物多样性和性能改善之间的微妙平衡。因此，最适当的方式可以是一种基于交配方案的方法，以防止控制，增加增长率，提高商业成熟度。
Dominga Soglia[ 1]; Stefano Sartore[ 1]; Sandra Maione[ 1]; Achille Schiavone[ 1;[*]; Sihem Dabbou[ 2;3]; Joana Nery[ 1]; Luisa Zaniboni[ 4]; Stefano Marelli[ 4]; Paola Sacchi[ 1];Roberto Rasero[ 1]. Growth Performance Analysis of Two Italian Slow-Growing Chicken Breeds: Bianca di Saluzzo and Bionda Piemontese[J]. Animals, 2020,10(6): 969