Produção de carne de ovina.

Abstract

The study was conducted in two distinct properties located in the region of Serra do Sudeste, Rio Grande do Sul, Brazil: counties of, Pedras Altas and Arroio Grande. The overall objective was to evaluate the possibilities of increased production of lamb meat quality by using alternative methods to increase productivity and the effect of three finishing systems and sex on growth and development of lambs. In the first study 74 sheep were used from the cross of Corriedale and Texel rams and three Poll Dorset breed. The animals were kept on ryegrass pasture and native grassland, and supplemented daily with a mixture of soybean hulls and corn in amounts determined according to the availability of forage and the needs of each category. The sheep were subjected to the male effect and exposed to artificial reduction of photoperiod and later synchronization, needed in times (December and August). Fixed mating season was and response to the rate of estrus. The rates of estrus observed in this study show no significant difference (P <0.05) between the periods studied in the first service. However following the a second mating of sheep, differences were observed, where at the time of June a lower rate of expression of estrus (80%) was obtained. It is concluded that the use of management with the control of photoperiod in times of mating unconventional causes estrus rates over time traditionally used. In the second stage were used 90 x Corriedale lambs Texel, and 45 non-castrated males and 45 females divided into three finishing systems lamb with mother grazing (CMPN); lamb weaned, grazing (CDPN), lambs weaned, grazing supplemented with soybean hulls to 1% body weight (CDPNS). The slaughter criterion was 2.0 to 3.0 corporal condition. The effect of sex was higher in males for Initial Weight, GPTotal, GmdTotal, weight at 100 days, GP 70-100, Gmd70-100, weight at 120 days, anterior height, back Height, body weight, HCW, skin, full green guts, legs, head, heart, lung + trachea., liver vesicle., bladder and kidneys, for the female sex was higher for internal fat and fat-renal pelvic in percentages. The treatment effect was manifested to GmdTotal, GP 70-100, Gmd70-100, GP 100-120, 100-120 ADG, heart, internal fat and pelvic renal fat and percentages for HCW and full green guts.