By Llias Kyriazakis
A large number of qualitative info has been collected on many elements of pig biology over contemporary years, in components akin to genetics, development and body structure, and welfare. it truly is now well known that there's a have to use those info as a foundation for the improvement of quantitative versions, so as to extra enhance functionality and productiveness. This has been completed in a few parts, significantly body structure, yet no prior try at bringing jointly and integrating this fabric has been made. This publication, written through best researchers from Europe, the united states and Australasia, fills that hole. It starts off with descriptions of the animal, its feed and its atmosphere. specialists then speak about the newest mechanistic mathematical versions which describe specific physiological techniques and keep in mind the most exterior impacts. the gathering concludes with a evaluation of the benefits and implications of a quantitative method of pig biology. the information provided should be crucial studying for animal scientists, really utilized physiologists, with an energetic curiosity in pigs and also will have relevance to investigate on different cattle.
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Additional info for A Quantitative Biology of the Pig
A. (1987) Sexual development and semen production in boars. Pig News and Information 8(4), 389–396. G. R. (1988) Genotype and sex effects on the relationship between energy intake and protein deposition in growing pigs. Journal of Animal Science 66, 676–686. R. M. (1983). The influence of feeding level from 20 to 45 kg live weight on the performance and body composition of female and entire male pigs. Animal Production 36, 193–199. K. (1981) Influence of confinement and season of the year on puberty and estrous activity of gilts.
P. 1. a Feed Live wt Fat-free Carcass Feed (kg) intake feed Fat depth lean gain fat gain lean ADG (cm) (g dayמ1) (g dayמ1) gain (kg) (kg dayמ1) (kg dayמ1) conver. 2 a The data included three European and four US terminal cross genotypes with 28 or 32 pigs per genotype-sex group. 5 kg live weight. The third concept is that the relative emphasis the selection criterion places on the component traits directs the relative genetic changes in each trait. The selection criterion can be either a designed selection index, a function of performance traits or BLUP genetic merit estimates, or a composite trait like lean tissue feed conversion.
Maintenance requirements for energy can be expressed as a function of live weight or protein mass (ARC, 1981; Whittemore, 1983; NRC, 1988). , 1983; Noblet and Henry, 1991) indicate that such relationships only explain part of the variation of maintenance energy requirements that are observed between different groups of pigs. Maintenance energy requirements are better expressed in relation to the distribution of the major tissue groups (viscera, muscle, fat) in the pig’s body (Ferrell, 1988). The contribution of the activities of each tissue group in relation to the total maintenance energy requirements should be considered.