Performance and morphometry of the gastrointestinal tract of goats kept on pasture during the dry period of the semi-arid Pernambuco
The carcass length, your characteristics and of non-carcass components are directly related to the nutritional composition of the diet. The production of good quality protein also depends on the genotype and the environment in which the animal is held, which points to the importance of the use of supplementation, at the time of low rainfall, which creates food shortages, especially in native pasture , which is characterized by high variation in the chemical composition throughout the year, especially when it comes to semi-arid region, Caatinga vegetation, which has its own characteristics, such as loss of leaves and disappearance of native species in the dry season. The experiment aimed to evaluate the endogenous losses in goats kept in grazing unrestricted with and without supplementation, and restricted grazing. 18 animals were used without pattern purebred (WPPB), neutered, with average live weight of 16 kg ± 0.22 BW with 90 days of age, undergoing an adjustment period for 15 days. The animals were divided into three treatments: grazing at will without supplementation to slaughter (GWS), grazing at will over supplementation with forage palm + soybean meal (GS) and restricted grazing (RG), with access to pasture during about four hours / day, or according to the maintenance of BW. For statistical analysis was used the test F with 5% of probability. A significant difference was observed for slaughter weight (P=0.00023) with higher means for the treatment GS (22.74 BW) when compared with others treatments, however there was no difference between the GWS (18.12 BW) and RG (16 BW) treatments. The same behavior was also observed for weight empty body (18.4 BW, 14.34 BW and 12.60 BW, respectively) (P=0.00026). A significant difference (P=0.00965) was observed for rumen / reticulum, omasum, small intestine, and total gastrointestinal tract to the GS did not differing between GWS and RG. WPPB goats supplemented during the dry period had higher values of morphometric gastrointestinal tract in relation to goats kept on pasture only or restricted grazing.
Keywords: goats, growth, pasture