Efeito de planos de nutrição e de genótipos sobre características físicas de carcaça de suíno

Abstract

One experiment with 72 barrows pigs (±30 kg live weight) from AGROCERES-PIC was conducted at the DZO/UFLA in order to verify the effect of nutrition plane and genotypes on carcass traits of pigs slaughtered at different weights. It was tested 3 different nutrition planes: A –single nutrition plane in growing, finishing, after-finishing I and after-finishing II phases; B – two planes, one in growing and finishing phases and another in after-finishing I and after finishing II phases and C – a different plane at each phase, all based on lysine levels of the diet. A randomized block design with 4 blocks and 3 replications by block was used with the treatments in factorial scheme 3x2 (nutritional plan and genotypes). At the end of each phase the animals were slaughtered and his carcass were evaluated by carcass traits. The slaughtered weight study was used as covariable. No nutritional plan influence (P > 0,05) the characteristics. That's genotype I swine's were better (P<0,05) in P2, carcass dressing and carcass length. Carcass dressing and carcass length, as well as fat percentage increased linearly with slaughtered weight and meat and lean cuts percentages was reduced. It was concluded: is possible the use of any nutrition plan from start of growing to slaughtered; the animais that's more genes from LargeWhite, Pietrain and Yorkshire would yield less fat carcass; slaughter of most weight pigs can load to Higher carcasses dressing and length, therefore resulted in more fatter carcasses.