Record nummer 1897115
Titel artikel Influence of level of zilpaterol chlorhydrate supplementation on growth performance and carcass characteristics of feedlot lambs
Auteur(s) Estrada-Anguloa, A. ; Barreras-Serranob, A. ; Contrerasa, G. ; Obregona, J.F. ; Robles-Estradab, J.C.
Tijdschrifttitel Small ruminant research : the official journal of the International Goat Association
Deel(Jaar)Nummer (2008)80
Paginering 107 - 110
Online full text
Trefwoorden (cab) karkassen / karakteristieken / lammeren / prestatieniveau / agonisten
Rubrieken Samenstelling en kwaliteit van diervoeders
Publicatie type Artikel
Taal Engels
Toelichting (Engels) Forty-eight Pelibuey×Katahdin (38.8±0.67 kg) crossbred male lambs were used in a 32- day feeding trial (four pens per treatment in a randomized complete block design), to evaluate the influence of zilpaterol (_2-agonist) supplementation level on growth performance and carcass characteristics. Lambs were fed a dry-rolled corn-based finishing diet (3.04 Mcal/kg of ME) supplemented with 0, 0.15, 0.20, or 0.25 mg/kg of live weight d−1 zilpaterol (as zilpaterol chlorhydrate, Zilmax®, Intervet México, México City). DM intake averaged 1.099±0.042 kg/d and was not affected (P = 0.40) by treatments. Compared with control lambs, zilpaterol supplementation increased gain efficiency (15.8%, P < 0.03), apparent energy retention per unit DMI (10.9%, P = 0.03), and tended to increased daily gain (16%, P < 0.07) and total gain (17.7%, P < 0.08). Zilpaterol supplementation did not affect (P = 0.20) carcass weight, longissimus muscle area (LM), or fat thickness, but increased (2.3%, P = 0.04) carcass dressing percentage and reduced (36%, P < 0.01) kidney-pelvic fat. Increasing level of zilpaterol supplementation increased total weight gain (linear component, P < 0.05), gain:feed (linearcomponent, P < 0.01), and dressing percentage (linearcomponent, P < 0.02), and decreased (linear component, P < 0.01) kidney-pelvic fat. We conclude that zilpaterol supplementation enhances growthperformance and dressing percentage inlambs in amanner comparable to that of cattle (greater muscle accretion, reduced body fat). Responses to zilpaterol was optimal when supplemented at 0.20mg of zilpaterol/kg of live weight d−1
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