Investigação

Início / Investigação / Artigos / Effects of diets during growth and their repercussion on the quantitative and qualitative characteristics of carcass.

Effects of diets during growth and their repercussion on the quantitative and qualitative characteristics of carcass.

Ano
2000
Abstract

In this experiment the following productive parameters were assessed: average daily gain (ADG), feed conversion efficiency index (CI) and the evolution of the back fat in pure‑breed Alentejano genotype (AL) and cross‑breed (LW x Duroc) x AL pigs, using two different diets: balanced commercial feed (A) vs Triticale (T) with premix and lysine supplements. A total of 48 sexually neutralized male and female pigs were used, with an initial average weight of 31.3 kg, which were split into four groups of 12: (i) Alentejano, fed with Triticale; (ii) Alentejano fed with commercial feed; (iii) Cross‑breed, fed with Triticale; and (iv) Crossbreed, fed with commercial feed. The animals were housed in individual cells, with automatic feeding and drinking equipment, making it possible to have a controlled individual feeding system, in which the daily amount of feed supplied was adjusted every fortnight according to need (INRA tables, 1987) up to a maximum of 3.1 kg/animal per day, distributed as a single daily meal. During the experiment the animals were weighed every fortnight in order to determine the ADG. The amount of feed intake was assessed with the same frequency in order to determine the CI. The back fat thickness as well as the depth of the longíssimus dorsi muscle were measured monthly, using echography. The animals were slaughtered when they reached ±100 kg live weight and ten months in age. Once slaughtered, the carcasses were dissected in order to assess the percentage of lean meat, the fat/muscle relation and the muscle/bone relation. When comparing the genotypes, a significantly higher (P<0.01) ADG was observed in the cross‑bred animals, although the differences in CI were not significant. Considering the effect of diets, in treatment A the ADG was higher (P<0.001) as well as CI (P<0.001). The genotype x diet interaction was significant in both parameters (P<0.01). When assessing the carcasses it was observed that the cross‑bred pigs had a greater proportion of muscle and noble pieces than the pure‑bred Alentejano (P<0.001) and thus a smaller proportion of fat (P<0.001). The diet significantly (P<0.05) affected the percentage of fat, the loin area and the bone weight. In the genotype x diet interaction, the differences were not significant.

Palavras Chave

Alentejano breed; farm diets; carcass characteristics.

Tipo de Artigo
Investigação
Tipo de Revisão
Internacional
Âmbito Geográfico
Internacional
Situação
Publicado
Referência

Nunes, J.; Paiva, J.; Gomes, C.; Freitas, A.; Almeida, J. (2000). Effects of diets during growth and their repercussion on the quantitative and qualitative characteristics of carcass. Options Méditerranéennes . Serie A : Séminaires Méditerranéennes,41: 159‑163.