The effect of plane of nutrition on the carcasses of pigs and lambs when variations in fat content are excluded

Abstract

1. From a review of the literature it has been shown that there are two opposing views regarding the best method of interpreting growth data, which arise from conflicting opinions as to the role of fat deposition in the growth of the animal.2. Data of McMeekan and Palsson and Verges have been re-analysed and their own results are compared with results obtained when the effects of variation in fat content are eliminated.3. No evidence has been found of any effect of plane of nutrition on the total weights of bone and muscle relative to the weight of bone plus muscle together.4. The weight of bone plus muscle in the head and neck was increased relative to the total weight of bone plus muscle during periods of restricted nutrition. Apart from this there was no clear evidence of a relationship between the order of maturity of the joints and their relative retardation of development.5. Huxley's allometry equation was found appropriate for standardising the measurements, and the exponent was taken as a numerical expression of the relative maturity of each tissue or part.

The influence of pasture species and exogenous oestrogen treatment on the live-weight gain and carcass composition of lambs

“…The absence of a significant difference between the slopes of the regression lines for individual pasture treatments supports the claims of Tulloh (1963) and Elsley, McDonald, and Fowler (1964) that rates of growth of carcass components relative to total carcass are not greatly affected by plane of nutrition. Although the carcass composition is affected by oestrogen treatment, these differences are not large enough to show significant variation in the relative rates of growth of fat, water, and protein to total HCW.…”

Weight Gain and Carcass Measurements of Pigs from Gilts Fed Adequate vs. Protein-Free Diets during Gestation

“…of age on subsequent performance or carcass measurements. Elsley and McDonald (1964) concluded from their own data and from recalculations of the data of McMeekan (1940a,b,c) that plane of nutrition has no effect on the carcasses of pigs when variations in fat content are excluded. In the present experiment the small, but statistically significant, greater initial (weaning) weight of C-C and PF-C pigs as compared to C-PF and PF-PF pigs apparently did not represent a sufficient difference to significantly affect subsequent performance.…”

Fat Distribution in Swine as Influenced by Liveweight, Breed, Sex and Ration

“…It has been shown that muscle distribution is relatively constant in cattle (Berg and Mukhoty,1970;Butterfield, 1965) and in pigs (Richmond and Berg,l97lb), and that fat is the major contributor to differences in carcass composition (Elsley et al, 1964;Hammond, 1932;Richmond and Berg, l97la;Tulloh, 1963). However, only a few experiments have been conducted to study the distribution of fat in the carcass.…”