A Report On Feed Intake Essay
Bernabucci et al., 2009 described a reduction in feed intake by finishing lambs as a result of heat stress conditions. Dávila-Ramírez et al., 2014 hypothesized that the use of β-adrenergic agonists as a feeding management strategy to improve carcass characteristics in reduced feed intake lambs. Zilpaterol hydrochloride (ZH) use in steers resulted in the mobilization of tissue from visceral organs and directed these nutrients to carcass tissues during periods of ZH supplementation (Baxa et al., 2010). The mobilization of non-carcass tissue nutrients results in lower energy requirements for growth and subsequently lower feed intake (Reeds and Mershmann, 1991). However, Macías-Cruz et al., 2010; observed that ZH increases longissimus muscle (LM) area without effects on feedlot performance of ewe lambs. Objectives to test this hypothesis were: feed 40 similarly aged and sized (body weight) across 4 treatments.
Materials and Methods
Forty Dorper × Pelibuey crossbred 4 month old ram lambs (31.7 ± 2.30 kg) were housed individually in pens with ad libitum water and shade was provided. Ram lambs were adapted 20-d to pens and a basal diet before initiation of treatment. All animals received 1 mL injections of vitamins A, D and E, and were treated for internal and external parasites with 0.5 mL Invermectin. Lambs were individually weighed and stratified by BW and assigned treatments across BW groups in a completely randomized design one week before the experimental phase.…