The effect of rate of gain during the growing and finishing periods on the feed efficiency and carcass composition of the pig. 2. Contrasting patterns of growth produced by different rates of gain from 20 to 55 kg and 55 to 87 kg live weight

Walker, N.; Holme, D.W.; Forbes, T.J.

J. Agric. Sci 71: 319-326


Accession: 014735587

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Pigs were grown at high, moderate and low rates of gain from 20 to 55 kg and from 55 to 87 kg liveweight. Half carcasses were divided into 4 joints and each joint was dissected into bone, skin, subcutaneous fat and lean meat. The boneless tissue of each joint was analysed chemically. During the first period efficiency of feed conversion was proportional to growth rate; in the second period it depended on growth rates in both periods. Restricting growth rate in the first period improved efficiency during the second period and for the whole trial. Carcass length was not affected by the pattern of growth. Proportion of gammon in the dissected side was lower in pigs growing fastest in both periods than in any other pigs. Those pigs also had a smaller proportion of shoulder and a larger proportion of middle. The changes were due largely to the effect of the pattern of growth on distribution of fat. Fastest growth throughout significantly increased the fat content of carcass. There was no significant difference among the other 5 groups. Growth rates had little effect on chemical composition of the fat-free boneless meat.