Efeito da suplementação lipídica sobre desempenho e perfil metabólico de cabras Saanen em lactação.

Abstract

In last decade, several researches were carried out in the semiarid region of the Brazilian northeast, to know foraging grass potentiality, in goats' feeding as food source of low cost. For example, the use of favelone (Cnidoscolus phyllacanthus (Mart.) Pax et K. Hoffm.) as fat source in the feeding period of animals. The information available in the literature are scarce and, at most, they refer to bovine. It was used 16 Saanen goats with alive weight of 35 Kg and daily average production of 1,2 kg of milk, which were distributed into a Latin square with three repetitions. The diets were constituted without fat supplementation; TC (control treatment) and with fat supplementation; SF (favelone seed); TF (favelone cake) and CA (cotton seed). The study was developed in four experimental periods of 14 days, the first 10 days were used for the adaptation of the animals to the diets, and the last four days were used for milk measurement. Last day of each period were accomplished by blood and ruminal fluid collections. In general, reduction in the dry matter intake characterized the animals answer to the available food, suggesting that the presence of oleaginous seeds in the diet reduces the food intake. The animals’ milk average production was 1134 g day-1, milk production, corrected to 3.5 and 4% fat (g), total dry extract (%), defatted dry extract (%), milk production, corrected for total solid (g), density (%) and acidity (D°), did not show difference among treatments. It was not observed difference among treatments with regard to serum urea, creatinine, GGT, glucose, calcium, phosphorus and magnesium. However, animals submitted to SF, TF and CA had smaller dry matter intake, crude protein and crude energy for metabolic unit, total carbohydrates and not fibrous carbohydrates than control group. Dry matter digestibility coefficients, crude protein, organic matter, neutral detergent fiber and total carbohydrate did not differ (P>0.05) among diets. The results indicate that these animals had a higher efficiency in the diet utilization. This work demonstrated that, both Favelone seed and cake, attended the physiologic necessities of lactating goats, without affecting the quality of milk and its quantity.