Varying Amounts of Rumen-Inert Fat for High Producing Goats in Early Lactation

Abstract

This study determined the responses of early lactating goats fed varying amounts of rumen-inert fat. Forty multiparous high producing Alpine does in the first 2 wk of lactation were assigned randomly to four isonitrogenous dietary treatments containing 0, 3, 6, and 9% added fat. The study consisted of a 2-wk preliminary and a 10-wk experimental period. Feed intake, blood glucose, and rumen pH were not affected by dietary treatments. Body weight gain and milk production decreased linearly as dietary fat increased. Peak production was higher with 3% added fat than with 6 and 9%. The SCC, total solids, and lactose contents of milk were unaffected by fat percentage. Milk fat percentage increased linearly as fat percentage increased; milk protein content was highest at 6% dietary fat addition. The rumen-inert fat tended to increase long-chain fatty acids and to reduce short-chain fatty acids of milk. These findings suggest that fat supplementation at 3% of the total diet can increase fat percentage in milk from high producing dairy goats in early lactation.

Efeito da suplementação de lipídios sobre a digestibilidade e os parâmetros da fermentação ruminal em cabras leiteiras

“…Os valores de pH obtidos neste trabalho foram similares aos observados por Teh et al (1994), ao trabalharem com a adição de gorduras inertes em dietas de cabras no início da lactação. A média (6,33), por sua vez, foi semelhante à obtida por Branco (2005), de 6,27, com nível de 35% de participação de FDNf (fibra em detergente neutro proveniente da forragem).…”

“…Na maioria dos experimentos envolvendo suplementação lipídica para ruminantes, são utilizados bovinos como modelo animal, tornando escassas as informações dos efeitos dos lipídios sobre as características de fermentação ruminal em caprinos (Teh et al, 1994;Lana et al, 2005). Segundo Van Soet (1994) e Chilliard et al (2003), os caprinos possuem comportamento alimentar e metabolismo diferenciados em relação a outras espécies de ruminantes e, portanto, podem apresentar respostas distintas ao fornecimento de lipídios.…”

Lactation curves and economic results of Saanen goats fed increasing dietary energy levels obtained by the addition of calcium salts of fatty acids

“…According to Sanz Sampelayo et al (2002a), there were problems on palatability, and Sanz Sampelayo et al (2002b) observed no effect on milk yield in CSFA-supplemented animals. Teh et al (1994) observed weight loss and a reduction in milk yield with CSFA supplementation, while Hosam (2011) observed an increase in milk yield in CSFA-supplemented animals, but only with the highest energy level of supplementation (50 g/kg).…”

“…Great amounts of energy are required by high-yielding goats during early lactation when the feed intake capacity is limited, leading the animals to mobilize their body energy reserves (Teh et al, 1994). Thus, it is important to provide lactating goats with palatable feed containing a high energy density (Ribeiro, 1997).…”

“…One way to increase the efficiency of energy use without increasing the addition of concentrate in the diet or compromising fiber digestibility, is to supplement animals with protected fat in the form of calcium salts of fatty acids (CSFA), which allows a higher level of dietary lipids with minimal interference in rumen environment (Teh et al, 1994;Palmquist and Mattos, 2011). However, interactions among lipid supplementation, mobilization of body reserves and milk yield are not yet completely understood (Chilliard et al, 2003).…”