Diel and nutritional variables in Santa Ines lambs castrated and uncastrated submitted to food restriction

• Autor(a) principal: Monalisa Eva Santos Evangelista
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFC
• Texto Completo: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15951
• topic: Comportamento alimentar; IngestÃo de nutrients; NutriÃÃo animal; Ovinos; Feeding behavior; Nutrient intake; Sheep; ZOOTECNIA

The objective of the present study was to evaluate the effect of food restriction and sexual group on intake, digestibility of nutrients: dry matter (DM), organic matter (OM), mineral matter (MM), crude protein (CP), ether extract (EE), neutral detergent fiber (NDF), acid detergent fiber (ADF), non-fibrous carbohydrates (NFC), total carbohydrates (TC), total digestible nutrients (TDN) and diel behavior patterns intake of Santa Ines lambs. A total of 30 sheep was used, with average initial weight of 13.00 Â 1.49 kg in a completely randomized design in factorial 3x2, with three levels of restriction (ad libitum, 30 and 60%) and two sexual groups (castrated and uncastrated). The animals were fed on experimental diet composed of a forage:concentrate ratio of 60:40, with Tifton-85 hay (Cynodon spp.) as roughage. There was no sexual group effect or interaction between sexual group and food restriction levels for all variables analysed (P>0.05). The consumption of all nutrients were influenced by food restriction levels (P<0.05), decreasing according to the increase in restriction levels. Conversely, nutrient digestibility coefficients increased proportionally with food restriction levels (P<0.05). The feeding behavior variables were influenced by food restriction (P<0.05). Variations in feed time (hour/day), rumination efficiency (g DM/hour) and (g NDF/hour), ruminating time (hour/day) and total chewing time (hour/day) decreased with rising levels of food restriction (P<0.05). For the âFeed efficiency&#8223; variable (g DM/hour) and (g NDF/hour), food restriction led to an increase in efficiency of the restricted animals (P<0.05). Similarly, the increase in levels of food restriction promoted greater time spent in idleness restriction of animals (P<0.05). The variable number of ruminal bolus (No./day) and ruminating chewing number reduced with food restriction (P<0.05). However, chewing ruminating time increased with the restriction (P<0.05). As conclusion, food restriction promotes a reduction in nutrient intake and increased digestibility of the diet, thus providing increased efficiency in the absorption of nutrients in animals undergoing the level of 60% food restriction. The feeding behavior patterns are also altered by dietary restriction, especially the food expenditures times, ruminating and idleness and ruminating chewing patterns.