Effects of high concentrate supplementation of Saint Croix sheep during peripartum on neonatal lamb behaviour

Abstract

The aim of this study was to determine whether increasing concentrate supplementation to ewes during the peripartum would benefit ewe and lamb vigour. Pregnant ewes were randomly assigned to either a maintenance group (MG) or a supplementation group (SG). The diets given covered energy requirements and consisted of pasture, forages and commercial concentrate; however, SG ewes received higher concentrate ration. Body weight and blood metabolites were assessed weekly. Lambs were weighed and their behaviour was observed. Data were analysed using repeated-measures test or ANOVA. During peripartum, the body weight was significantly higher in SG ewes compared with MG ewes (P = .02). Indicators of energy metabolism were similar between groups (P > .05). Latency to first suck was 10 minutes shorter in SG lambs compared with MG lambs (P = .005). Lamb weight was similar between groups, and there was a negative correlation between lamb birthweight and time to first suckle that was independent of diet group. This study demonstrates that high concentrate supplementation of ewes during peripartum results in higher body weight postpartum but does not change metabolic status. Latency to first suck was shorter in lambs born to SG ewes suggestive of enhanced vigour related to supplementation.

Keywords

• Lamb vigour
• body weight
• pregnancy
• ewe metabolism
• concentrates