Revista Brasileira de Zootecnia
versión On-line ISSN 1806-9290
GENTIL, Renato Shinkai et al. Replacement of coastcross hay by soybean hulls in diets for lactating goats. R. Bras. Zootec. [online]. 2011, vol.40, n.12, pp. 2844-2851. ISSN 1806-9290. http://dx.doi.org/10.1590/S1516-35982011001200031.
The objective of this experiment was to verify the response of lactating goats fed diets with different levels (content) of soybean hulls replacing coastcross hay (Cynodon sp.) on performance. Thirty-six lactating Saanen goats (38±5 days of lactation; 2.1±0.4 kg/day) were assigned to a randomized complete blocks design and housed for 8 weeks. Goats were fed diets of 50% roughage and 50% concentrate, but with the same amount of neutral detergent fiber. Soybean hulls replaced hay by 0, 33, 67 or 100% of the dry matter (DM). Dry matter and NDF intake and feed efficiency showed a quadratic response to the levels of soybean hulls in the diet. Milk yield and body weight variations did not change; however, milk fat, lactose and total solids concentration increased while time spent with rumination and chewing decreased, when soybean hulls were added to the diet. Soybean hulls can replace entirely coastcross hay in diets for lactating goats, with no detrimental effect on milk yield or with an increase on milk fat and lactose concentration. Compared with chopped coastcross hay, soybean hulls show less effectiveness to stimulate rumination and chewing.
Palabras clave : Cynodon sp.; effective fiber; intake behavior; milk production; performance.