Effect of high-concentrate diets with calcium lignosulfonate and cottonseed processing method on quantitative traits and non-carcass components of feedlot cull ewes.

Abstract

This study examined the effects of cottonseed processing form and the inclusion of calcium lignosulfonate in high-concentrate diets for feedlot cull ewes on carcass traits and non-carcass components. Thirty Santa Inês cull ewes with an average body weight of 44.2  $\pm$  5.2 kg and an average age of 50 months were distributed into collective stalls in a completely randomized design. The treatments consisted of diets including whole cottonseed, crushed cottonseed, whole cottonseed treated with lignosulfonate (100 g/kg, as fed), crushed cottonseed treated with lignosulfonate (100 g/kg, as fed), and a control diet without cottonseed. The experimental diets did not influence ( $P>0.05$ ) average daily weight gain (0.195 kg/day), slaughter weight (51.74 kg), or in vivo biometric and on-carcass measurements. There was no difference ( $P>0.05$ ) in loin-eye area or subcutaneous fat thickness as evaluated in vivo by ultrasound. There was no diet effect on hot carcass weight and yield (24.8 kg and 47.8 %), cold carcass weight and yield (24.2 kg and 46.8 %), or chilling loss (2.1 %). Non-carcass components did not differ in response to the diets ( $P>0.05$ ). Dietary inclusion of calcium lignosulfonate increases the proportions of udder and liver relative to empty body weight ( $P<0.05$ ). Neither the cottonseed processing method nor the inclusion of calcium lignosulfonate in high-concentrate diets for cull ewes affects their performance, biometric or morphometric measurements, non-carcass components, or qualitative traits of their carcass.