Effects of ractopamine step-up use programs on finishing pigs fed under commercial conditions
نویسنده
چکیده
Methods: A total of 1050 pigs were assigned to pens (n = 48) on the basis of weight and gender. Average body weight at trial initiation was 78.5 kg. Four dietary treatments were randomly assigned to pens and stratified across weight and gender. Dietary treatments included control (0 g/ tonne RAC for 35 days); constant (5.0 g/ tonne RAC for 35 days); Step 2 (5.0 g/ tonne RAC for 14 days then 10.0 g/tonne for 21 days); Step 3 (5.0 g/tonne RAC for 21 days then 10.0 g/tonne for 14 days). Pen and feed weights were recorded weekly to determine live performance variables. All pigs were transported to market after the experimental period, and packer sheet data were collected for assessment of carcass response.
منابع مشابه
Effect of gender (gilt and surgically and immunocastrated male) and ractopamine hydrochloride supplementation on growth performance, carcass, and pork quality characteristics of finishing pigs under commercial conditions.
This study evaluated the effects of gender and feeding of ractopamine on growth performance, carcass, and meat quality characteristics of pigs reared under commercial conditions. The study was performed as a randomized complete block design (blocking factor date of start on test) with a 3 × 2 factorial arrangement of treatments: 1) gender [gilt vs. surgical castrate vs. intact males immunocastr...
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