干旱区生态环境知识资源中心(Arid): Adaptive, morphometric and productive responses of Brazilian hair lambs: Crossing between indigenous breeds- A machine learning approach

Arid

DOI	10.1016/j.smallrumres.2024.107208
	Adaptive, morphometric and productive responses of Brazilian hair lambs: Crossing between indigenous breeds- A machine learning approach
	Silveira, Robson Mateus Freitas; Mcmanus, Concepta Margaret; Carrara, Eula Regina; Vecchi, Laura Bertolaso; De Carvalho, Joao Rayonio de Sousa; Costa, Helio Henrique Araujo; Pilonetto, Fabricio; Favero, Luiz Paulo Lopes; Landim, Aline Vieira
通讯作者	Silveira, RMF
来源期刊	SMALL RUMINANT RESEARCH
ISSN	0921-4488
EISSN	1879-0941
出版年	2024
卷号	232
英文摘要	For the first time, the thermoregulatory, morphometric and productive responses of the Morada Nova breed and its crosses with the Santa In & ecirc;s and Rabo Largo breeds in the Brazilian semi-arid region were evaluated. Subsequently, the relationship between thermoregulation and morphometric, productive and non-carcass components was verified. 30 lambs, weighing 2.26 +/- 0.53 kg at birth and 7.31 +/- 1.85 kg at weaning, were distributed into three genetic groups: Morada Nova (M-N) and its F-1 crossbred Morada Nova x Rabo Largo (R(L)xM(N)) and Morada Nova x Santa In & ecirc;s (S(I)xM(N)) animals in a completely randomized factorial design (3 genetic groups x 2 sexes). Machine learning techniques were performed in order to understand the relationship between the variables and in order to identify phenotypic biomarkers. No interaction effect was observed for any variable under study (P > 0.05). Male lambs have higher heart rate (P = 0.03), are heavier (P < 0.001), have higher weight gain (P < 0.001) and higher skin weight (P = 0.01) when compared to females. M-N xS(I) lambs showed lower heart rate (P = 0.03) and rectal temperature (P = 0.02). Respiratory rate was similar (P = 0.26) between genetic groups. It was also observed that crossbred lambs had higher morphological measures, non-carcass components and productive responses (P < 0.001). Lung weight in purebred animals was lower (P = 0.01) when compared to M-N x S-I, but equal to M-N x R-L. The first component was characterized by morphological, productive and non-carcass components, and the second component by thermoregulatory response. The canonical correlation analysis showed that the thermoregulatory response is influenced by the morphological response (P = 0.002). Furthermore, the weight of non-carcass components does not have a relationship (P = 0.834) with thermoregulatory responses. Finally, the thermoregulatory responses did not influence (P = 0.717) the productive responses of sheep in the Brazilian semi-arid region. The redundancy index showed that 36.1% of the variation in thermoregulatory responses is explained by morphological responses, more specifically: the smaller the body length and chest circumference, the higher the animal's heart rate. The productive and morphometric responses and the non-carcass components are the main phenotypic biomarkers used to differentiate the genetic groups of lambs. The crossing of the native Brazilian semi-arid region breed led to higher body weight attributed to higher adaptability, manifested by lower rectal temperature and heart rate with no recorded increase of the morphological indicators.
英文关键词	Adaptation Canonical correlation Native breeds Non-carcass components Semiarid
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001188897800001
WOS关键词	SHEEP ; ADAPTATION
WOS类目	Agriculture, Dairy & Animal Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/405632
推荐引用方式 GB/T 7714	Silveira, Robson Mateus Freitas,Mcmanus, Concepta Margaret,Carrara, Eula Regina,et al. Adaptive, morphometric and productive responses of Brazilian hair lambs: Crossing between indigenous breeds- A machine learning approach[J],2024,232.
APA	Silveira, Robson Mateus Freitas.,Mcmanus, Concepta Margaret.,Carrara, Eula Regina.,Vecchi, Laura Bertolaso.,De Carvalho, Joao Rayonio de Sousa.,...&Landim, Aline Vieira.(2024).Adaptive, morphometric and productive responses of Brazilian hair lambs: Crossing between indigenous breeds- A machine learning approach.SMALL RUMINANT RESEARCH,232.
MLA	Silveira, Robson Mateus Freitas,et al."Adaptive, morphometric and productive responses of Brazilian hair lambs: Crossing between indigenous breeds- A machine learning approach".SMALL RUMINANT RESEARCH 232(2024).