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Zootecnia Tropical
versión impresa ISSN 0798-7269
Resumen
SALVADOR, Alejandro et al. Effect of protected fat on production and composition of goat milk under tropical conditions. Zootecnia Trop. [online]. 2009, vol.27, n.3, pp.285-298. ISSN 0798-7269.
Effects of supplementation with protected fat and parity on goat milk production and composition were determined with 31 crossbreed Canarias goats located in Maracay, Venezuela. Also, effects on body weight changes, body condition, and blood triglycerides and cholesterol concentrations were evaluated. Additive linear statistical models with repeated measures of time with Proc GLM were used and Tukey test to detect significant differences. The treatment and the calving number had a highly significant effect (P<0.01) over the total production. Goat receiving diets with protected fat showed the longest lactation. Neither treatment nor parity affected milk physical characteristics, but the treatment did increase significantly (P<0.01) all milk components in a profitable way. Treatment had no significant effect on body weight, body condition or voluntary consumption. The calving number had a significant effect (P<0.01) on the milk components and body weight, all of them increased accordingly up to the 4th calving number. Neither treatment nor parity had a significant effect on blood cholesterol or triglyceride concentrations. There were not significant correlations between blood cholesterol and triglyceride levels or between milk production, milk component levels, body weight or body condition.
Palabras clave : milk composition; milk yield; protected fat; goat.