The effect of controlled nutrition on fattening capacity and carcass lean meat share with respect to sex in pigs
2003
Stupka, R. | Sprysl, M. | Citek, J. | Neuzil, T. | Cervenka, T. (Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Chovu Prasat a Drubeze)
The objective of this trial was to assess the influence of controlled feeding on the indicators of fattening capacity and carcass lean meat percentage with respect to sex in pigs. The test included 72 hybrid pigs (36/36 barrows/gilts) of LWs x (LW x L) genotype. The animals were subdivided according to the feeding technology and sex into four groups where the first two groups (1, 2) were fed ad libitum and the other two groups (3, 4) were restricted. The growth potential of the pigs was fully manifested in ad-libitum system of feeding. The maximum growth peak of barrows was reached at about 75 kg of live weight, after that the growth intensity declined while the feed conversion ratio (FCR) increased markedly. In gilts the system of ad-libitum feeding may be applied for the whole fattening period although the growth intensity declines from the same weight as well. The influence of feeding technology on FCR was proved mainly in barrows where there exists a statistically significant difference to the detriment of the group 1 (3.05, resp. 2.82 kg/kg of live weight gain). In gilts no such difference has been proved. The influence of feeding technology on the lean meat formation in the carcass was demonstrated mainly in barrows. The best results of the lean meat share were achieved in groups 4 (58.1%), 2 (57.1%), 3 (56.5%), 1 (55.1%). It may be stated that the controlled feeding system is suitable for barrows with body weight up to 90 kg from the viewpoint of maintenance of positive FCR, growth intensity and lean meat percentage, while in gilts ad-libitum feeding may be applied for the whole fattening period. Various feeding in barrows/gilts contributes evidently to a considerable unification of carcass weight as well as the lean meat percentage at the end of the fattening cycle.
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