By Llias Kyriazakis
A large number of qualitative info has been collected on many features of pig biology over fresh 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 information as a foundation for the advance of quantitative versions, with a view to additional increase functionality and productiveness. This has been completed in a few parts, significantly body structure, yet no past try at bringing jointly and integrating this fabric has been made. This booklet, written by way of major researchers from Europe, america and Australasia, fills that hole. It starts off with descriptions of the animal, its feed and its atmosphere. specialists then talk about the newest mechanistic mathematical versions which describe specific physiological techniques and keep in mind the most exterior impacts. the gathering concludes with a overview of the benefits and implications of a quantitative method of pig biology. the guidelines awarded should be crucial studying for animal scientists, fairly utilized physiologists, with an lively curiosity in pigs and also will have relevance to analyze on different livestock.
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Extra resources for A Quantitative Biology of the Pig
25 unsuitable in many circumstances. In particular, proteins containing high amounts of histidine, tryptophan and basic amino acids such as arginine and lysine will have higher N contents. 38, as conversion factors (AFRC, 1987). 25 have been reported (Salo-Väänänen and Koivistoinen, 1996). It is ironic that so much attention has gone into improving the accuracy of N determination, only to be negated if inaccurate conversion factors are used. Rather than protein per se, however, it is the amino acids that limit rate of growth and lean tissue deposition.
1983, demonstrated that young gilts fed at 77% of ad libitum from 28 to 60 kg live weight had delayed onset of puberty, whereas when energy restriction was not imposed until 60 kg live weight, no effect was evident on age at puberty. , 1981; Rydmer, 1994). , 1982; Dyck, 1988). However, for Chinese breeds and crosses between Chinese and domestic maternal lines, age at puberty ranges from 80 to 120 days of age (Legault and Caritez, 1982; Legault, 1985; Christenson, 1993). , 1982) indicate that both additive and non-additive (dominance or epistasis) genetic variation exist for age at puberty.
Assuming that maintenance energy requirements are determined by empty body protein mass, daily energy intakes at each live weight were predicted within 4% of observed feed disappearance (Schinckel, unpublished data). , 1995). Reproductive Performance Until the mid-1980s, swine selection programmes concentrated on growth and carcass traits. Currently, there is renewed interest in the genetic improvement of sow productivity traits. Also, recent concerns have been raised that antagonisms exist between reproductive performance and continued intense selection for lean efficiency.