In this review, we discuss the literature comparing growth performance, carcass characteristics, and meat quality of boars and barrows. Some aspects of the energy and nitrogen metabolism of boars, gilts and barrows given diets containing different concentrations of protein.
We also review the other benefits of rearing boars over barrows.
Performance, carcass, and meat quality advantages of boars over barrows: A literature review. Compared with barrows, boars have reduced feed intake, improved feed efficiency, less backfat, higher nitrogen retention, and leaner carcasses.
Copyright (C) 1997 American Association of Swine Practitioners. This paper reviews the literature comparing growth performance, carcass, and meat quality data between barrows and boars. Comparative response of swine and rats to high-fiber or high-protein diets.
Age at castration may affect growth performance of barrows.
It seems that superior muscle growth in entire males is manifested only when animals are approaching puberty.
It appears that a supply of protein in excess of requirements reduces the net energy available to animals, which in turn depresses the rates of deposition of protein and water, and to a lesser extent, the deposition of fat. The influence of castration on the growth of male pigs in relation to high levels of dietary protein. Lysine and tryptophan in diets for boars and barrows.
Further research needs to be conducted to determine whether the differences in body composition between boars and barrows are due to feed intake, or vice versa.
The magnitude of the differences in age to attain a given slaughter weight are greater between barrows and boars as bodyweight increases. The average daily gain (ADG) of boars increased linearly with increasing dietary protein levels ranging from 14%-22% in the growing period up to 55 kg (14 lb) liveweight and from 14%-18% in the finishing period up to 100 kg (220 lb), followed by a decline in gain at 24% or higher protein levels. Significant reductions in growth rate, feed efficiency, and nitrogen retention are evident in boars fed low-lysine diets (0.47%-0.60%). Compared with barrows, feed efficiency improvements in boars range from 2.6%-32.1% under various rearing conditions, thus saving 1.8-27 kg (4-60 lb) of feed during the grow-finish period compared to barrows. The response of pigs from 50 to 90 kg liveweight to dietary ideal protein. The findings on growth rate of boars relative to barrows have been inconsistent. Several factors can influence growth rate in swine and thus should be taken into consideration when the growth rate is compared between boars and barrows.