Concentrados a base de feno da parte aérea da mandioca e semente de linhaça em dietas para cabras em lactação

Abstract

Two experiments evaluated the performance and ingestive behavior of lactating goats fed different levels of cassava hay or flaxseed. In experiment one, eightmultiparous goats, 51.0 ± 6.2 kg of body weight and 120 days in milk, were randomly distributed in replicated 4x4 Latin square design. The treatments were three levels of hay of aerial part of cassava (HAC): 5, 10 and 15% DM of diet; plus the control treatment (0%). The times spent feeding (FEED) and ruminating (RUM) and total chewing time (TCT) decreased with HAC inclusion in diet, increasing total time spent idling (IDL) and mean duration per period of idles. Feeding and ruminating efficiencies were higher for HAC diets. Number of cud chews and chews per day decreased as HAC increased. There was no correlation among FEED or IDL with DM or NDF intakes, but RUM, feeding and ruminating efficiencies were correlated with DM and NDF intakes. HAC had no effect on DM and OM intakes and digestibilities, but decreased NDF and CP digestibilities. There was no effect of HAC on milk yield, but protein, lactose, total solids and non- fat dry extract yields in milk were increased. In experiment two, eight multiparous goats, with 44.0 ± 6.9 kg of body weight and 60 days in milk, were distributed in replicated4x4 Latin square design. The treatments were three levels of flaxseed in diet: 4, 8 and 12% DM; plus the control treatment (0%). There was no effect of flaxseed on ingestive behavior. Feeding and ruminating efficiencies were positively correlated with DM and NDF intakes. Flaxseed had no effect on DM, OM, NDF and CP intakes and digestibilities, but increased EE intake (linear effect) and EE digestibility (quadratic effect). There was no effect of flaxseed on milk yield, but flaxseed linearly increased fat, total solids, non-fat dry extract and lactose contents in milk. These studies showed that cassava hay and flaxseed can be added to the diet of lactating goats.