Performance and carcass characteristics of lambs fed on diets supplemented with glycerin from biodiesel production

Abstract

-This study was carried out to evaluate the influence of diets supplemented with glycerin as an alternative ingredient to corn on the performance and carcass characteristics of Santa Inês confined lambs. The study involved 27 lambs aged 90 days, having an average initial weight of 26.33 ± 0.15 kg. Lambs were randomly distributed into a control group and groups with diets containing 15 and 30% glycerin in the total feed. Diet was formulated with 40% roughage and 60% concentrate.The experimental design was completely randomized, and the production performance and carcass characteristics were analyzed by analysis of variance, and the subjective carcass characteristics, by general linear models. The daily average gain was 0.21, 0.24 and 0.23 kg/day; feeding conversion was 6.39, 5.73 and 5.92 kg of diet/kg BW for control animals, and those fed with 15 or 30% glycerin, respectively, without treatment differences. Lambs were slaughtered, weighing 34 to 36 kg, and average weight of the cold carcass and commercial carcass yield were evaluated. The results were, respectively, 15.97 kg and 49.18%, for control, 15.96 kg and 48.31% for animals fed with 15% glycerin, and 15.79 kg and 47.87% for those treated with 30% glycerin, with no treatment effects. Meat tenderness and cooking loss averages were not affected by diets, with 5.07 kg and 40.45%, 5.10 kg and 40.81%, and 5.27 kg and 39.04%, respectively, for control, and those fed with 15 or 30% glycerin. Therefore, it is possible to conclude that up to 30% of medium purity glycerin in the dry matter of the diet can be used to replace corn, without any negative effect on lamb performance or carcass characteristics.

Glicerina bruta na dieta de ovinos confinados: consumo, digestibilidade, desempenho, medidas morfométricas da carcaça e características da carne

“…Estes pesquisadores observaram decréscimo no consumo de matéria seca e atribuíram este fato aos elevados teores de sal (Na -5,38%) contidos na glicerina bruta. Gomes et al (2011), ao avaliarem níveis de glicerina bruta (0, 15 e 30%) na dieta de ovinos em confinamento, não observaram influência (P>0,05) no consumo de matéria seca, porém, os teores de N presentes na glicerina utilizada foi de 1,3%.…”

“…No presente trabalho, não foi verificada influência (P>0,05) dos níveis de glicerina bruta sobre a AOL dos animais, devido ao fato do peso final dos animais também não terem sido influênciados (P>0,05) (Tabela 5). Resultados semelhantes foram verificados por Gomes et al (2011) e Gunn et al (2010a, que trabalharam com níveis crescente de glicerina (0, 15 e 30%; 0, 15, 30 e 45%; e 0, 5, 10, 15 e 20%, respectivamente) na dieta.…”

Dietary glycerin does not affect meat quality of Ile de France lambs

“…Several researchers have evaluated the effects of different levels of glycerin on feedlot lamb performance (Musselman et al, 2008;Gunn et al, 2010;Gomes et al, 2011;Lage et al, 2014a). However, few studies have focused on the potential changes in meat quality and nutritional value brought about by dietary glycerin (Françozo et al, 2013;Bartoñ et al, 2013;Lage et al, 2014b).…”

Carcass and meat characteristics of different cattle categories fed diets containing crude glycerin

“…Although there are many studies on crude glycerin (MACH; BACH; DEVANT, 2009;PARSONS;SHELOR;DROUILLARD, 2009;GOMES et al, 2011), little information has been generated regarding the effects of this byproduct on the carcass and meat characteristics of cows and steer of dairy breed origin. On the other hand, because of the differences associated to dry matter intake and tissue deposition in the carcass in different animal categories (NRC, 1996) and the carcass and meat characteristics of cows and steer (VAZ et al, 2002;KUSS et al, 2005;PASCOAL et al, 2009;VAZ et al, 2010), it has become important to assess the animal product generated by including crude glycerin in the diet.…”