Performance of the Santa Ines breed raised on pasture in semiarid tropical regions and factors that explain trait variation

• Published in: Tropical animal health and production Vol. 46; no. 7; pp. 1249 - 1256
• Main Authors: de Farias Jucá, Adriana, Faveri, Juliana Cantos, Melo Filho, Geraldo Magalhães, de Lisboa Ribeiro Filho, Antônio, Azevedo, Hymerson Costa, Muniz, Evandro Neves, Pinto, Luís Fernando Batista
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer-Verlag 01-10-2014; Springer Netherlands; Springer Nature B.V
• Subjects: Age Factors; Analysis of Variance; Animal Feed; Animals; Biomedical and Life Sciences; birth weight; body regions; Body Weight - genetics; Body Weight - physiology; Body Weights and Measures - veterinary; Brazil; Breeding - methods; fat thickness; Female; females; lambs; Least-Squares Analysis; Life Sciences; Male; males; Meat - analysis; Meat - standards; Pasture; pastures; Phenotype; Regular Articles; Reproduction - physiology; ribs; Sheep - genetics; Sheep - growth & development; Statistical models; Tropical Climate; Tropical environments; tropics; variance; Variance analysis; Veterinary Medicine/Veterinary Science; weaning; weight gain; Weight Gain - genetics; Weight Gain - physiology; Zoology; Brazil; Morphometry; Ultrasound; Carcass; Lamb; Weight
• ISSN: 0049-4747; 1573-7438
• DOI: 10.1007/s11250-014-0635-0

This study aimed to evaluate sex, the number of lambs per birth, and the family effects on production traits in the Santa Ines breed of sheep by estimating the least square means and coefficient of variance for those traits. A total of 484 lambs were evaluated for the following traits: weight at birth, at weaning, and at 240 days of age; weight gain during the pre-weaning and post-weaning periods; height, width, and length of different body regions; and rib eye area and fat thickness between the 12th and 13th ribs. We observed coefficients of variation higher than 10 % for several traits. Generally, males were larger than females (P < 0.05), while lambs from single and double births were larger than lambs from triple births (P < 0.05). Family effect was significant (P < 0.05) for most traits and explained the highest percentage of residual variance. The results showed good development of Santa Ines sheep, especially during the pre-weaning period but no in post-weaning. Our study also showed that there is an effect of sex, birth type, and family, which must be included in any statistical model for the estimation of least square means and residual variance in ANOVA.