Performance of growing lambs fed grass silage with raw or extruded soybean or canola seeds

Abstract

, P. S. and do Prado, I. N. 1997. Performance of growing lambs fed grass silage with raw or extruded soybean or canola seeds. Can. J. Anim. Sci. 77: 455-463. Thirty-two Outaouais male lambs were assigned to a completely randomized design with a 2 × 2 factorial arrangement of treatments to determine the effect of extrusion of full fat seeds on performance and carcass quality. Raw (NE) and extruded (EX) isonitrogenous and isoenergetic mixtures of barley and either full fat soybean (SB) or canola seed (CA) were fed at a daily rate of 424 and 400 g, respectively. Lambs were fed silage ad libitum from 20 to 43 kg. Intakes of silage DM and total DE were similar among treatments. The ADG and concentration of total polyunsaturated fatty acids (FA) in muscle were higher for lambs fed EX than NE seeds and the effect was greater for SB than CA mixture; this tended (P = 0.06) to result in an interaction between seed and extrusion for polyunsaturated FA in muscle. Similar trends were observed for feed efficiency. This could reflect the response to heat treatment as extrusion significantly reduced N degradability of SB mixture but had no effect on that of CA mixture. Digestibilities of DM, N, and energy were higher (P < 0.10) for lambs fed SB than for lambs fed CA mixture and extrusion had no effect. Data suggest that extrusion of seeds can be used to improve performance of lambs fed a high forage diet and modify FA composition of the carcass. Le gain moyen quotidien et la concentration en acides gras polyinsaturés totaux du muscle ont été supérieurs pour les agneaux recevant les graines EX que les graines NE et la réponse a été plus grande avec SB qu'avec CA; ceci a eu tendance (P = 0,06) à donner une interaction entre la graine et l'extrusion pour la concentration en acides gras polyinsaturés totaux du muscle. Des tendances semblables ont été observées pour l'efficacité alimentaire. Ces résultats pourraient refléter la réponse au traitement thermique étant donné que l'extrusion a significativement diminué la dégradabilité de l'azote de SB sans avoir d'effet sur celle de CA. La digestibilité de la matière sèche, de N et de l'énergie (P < 0,10) a été supérieure pour les agneaux recevant SB comparativement à ceux recevant CA et l'extrusion n'a pas eu d'effet. Ces résultats suggèrent que l'extrusion des graines oléagineuses peut être utilisée pour améliorer la performance des agneaux recevant une ration riche en fourrage et modifier la composition en acides gras de la carcasse.

Desempenho e digestibilidade aparente em ovinos confinados alimentados com dietas contendo níveis crescentes de caroço de algodão integral

“…Este resultado corrobora o obtido por Urano et al (2006), que obtiveram valor médio de 183,7 g/dia em cordeiros Santa Inês alimentados com soja em grãos na dieta, e Petit et al (1997) para a não-extrusada. Esta resposta, provavelmente, ocorreu em virtude da maior seletividade dos animais pelo caroço de algodão, uma vez que o incremento de oleaginosas na dieta melhora o desenvolvimento da flora ruminal e o processo de fermentação.…”

Use of soybean cake replacing soybean meal in diets of lambs

“…Was expected that there would be a decrease in NDF digestion, since the oil provided through the rumen can cause reduced efficiency of fibrolytic bacteria (PETIT et al, 1997). However, this was not possible, due to the low lipid content in the experimental diets (less than 3%); with this, the negative effect of fat was minimized.…”

Colostrum and milk fatty acids of dairy cows as influenced by extruded linseed supplementation during the transition period

“…Feeding linseed clearly increased daily 18:3 excretion with milk from 1.3 to 2.2 g d (1 , but the recovery of 18:3 was very poor (B1%). This was unexpected since the lipids in extruded linseed are considered to be at least partially rumen-protected (Petit et al 1997;Doreau et al 2009), while for unprocessed oilseeds such a low recovery of fed 18:3 in milk is common (Collomb et al 2004;Chilliard et al 2007). Although on a low level, the clearly higher proportion levels of long-chain polyunsaturated FA in colostrum compared with milk fat underline the relative importance these FA have for the newborn calf.…”