Predicting empty body weight in growing goats: A meta-analytic approach

Autor(es)

Campos, Leticia Marra ^[1] ; Almeida, Amelia Katiane ^[1] ; Biagioli, Bruno ^[1] ; Resende, Kleber Tomas ^[1] ; Molina Almeida Teixeira, Izabelle Auxiliadora ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista UNESP, Dept Anim Sci, BR-14884900 Jaboticabal, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Small Ruminant Research; v. 155, p. 45-50, OCT 2017.
• Citações Web of Science: 1

Resumo

The objective of this study was to develop statistical models to predict empty body weight (EBW) by body weight (BW), testing the influence of sex (females, intact males or castrated males), type of diet (suckling or post weaning), and genotype (Saanen, 1/2 Boer x 1/2 Saanen, 3/4 Boer x 1/4 Saanen, and Indigenous goats). Individual records of 311 goats combined from 10 studies, with BW ranging from 4.3 to 47.4 kg were used. The EBW was computed as the BW at slaughter minus the weight of the contents of the digestive tract, urinary bladder, and biliary vesicle. Linear regression analyses were performed to develop the models, considering sex, type of diet, and genotype as fixed effects and random effect of study. CONTRAST statements were used to conduct all pairwise comparisons of fixed effects and all the statistical analyses were performed using SAS. The present study revealed that sex did not affect both intercept (P = 0.53) and slope (P = 0.19). On the other hand, the EBW prediction was affected by type of diet (P < 0.01), and genotype (P = 0.02). Therefore, were proposed different equations to predict EBW from BW for suckling and post-weaning Saanen goats, where gastrointestinal tract content (g/kg EBW) in suckling goat kids increased as they grew, oppositely it remained slightly constant in post weaning goats. The effect of genotype on the EBW:BW relationship was tested considering only post-weaning goats, and one equation was proposed for each genotype. In general, gastrointestinal tract content (g/kg EBW) decreased as goat kids grew in all genotypes' but Indigenous goats. The results also highlighted different gastrointestinal relative capacity between genotypes. The development of these equations would enable producers and researchers to predict the animal EBW, and develop strategic plans in a goat herd. (AU)

• Processo FAPESP: 14/14734-9 - Desenvolvimento de modelos para predição das exigências nutricionais de cabritos em crescimento
• Beneficiário: Izabelle Auxiliadora Molina de Almeida Teixeira
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/14091-3 - Relação entre a massa corporal e a massa de corpo vazio de caprinos em crescimento
• Beneficiário: Letícia Marra Campos
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica