Infertile bulls versus steers: II. Feed conversion efficiency and the effects of a high fat diet

Price, M. A.; Yeates, N. T. M.

doi:10.1017/s0021859600024461

Cited by 4 publications

(5 citation statements)

References 9 publications

(7 reference statements)

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“…Analysis of variance gave no evidence of a sex effect on the difference between the two High plane treatments, for fat deposition, as suggested by Price & Yeates (19716). There was, however, a significant (P < 0-001) effect of feed treatment alone on all the measurements of fat deposition (dressing %, kidney fat %, carcass fat %, offal fat % and fat depths at ' C \ 'Z' and ' J').…”

Section: Body Compositionmentioning

confidence: 79%

“…Neither of these results was significant, but the small number of cattle involved led Price & Yeates (19716) to speculate that the difference in utilization could be real. The present trial shows no evidence to support this, since the differences that exist could be fully accounted for in terms of a slight inequality in the growth-promoting potential of the two high plane diets, with no apparent sex effect on the difference.…”

Section: Meanmentioning

confidence: 93%

“…This gave a total lipid supplement of 7-5%, compared with the 5% used by Price & Yeates (19716) in obtaining their inconclusive result.…”

Section: Dietsmentioning

confidence: 98%

“…The main point of interest in the trial was the sex x feed interaction. It has been suggested by Price & Yeates (19716) that entire and castrated males utilize dietary lipid in a different manner.…”

Section: Meanmentioning

confidence: 99%

“…In assumed to have little effect on carcass composition farm animals it is generally held that non-males (Bensadoun & Reid, 1965;Kirton, 1970). However, are 'earlier maturing' than males (Berg, 1968), but Price & Yeates (19716) have suggested that tallow comparisons are rarely made at equal muscle + in the diet may promote greater fat deposition in bone weight. I t may be, therefore, that growth, steers (but not in bulls) than an isocaloric diet with including fat deposition, of non-males proceeds no additional tallow.…”

Section: Introductionmentioning

confidence: 99%

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The effects of added dietary lipid on the body composition of rams and wethers

Price

1975

J. Agric. Sci.

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A 2 x 3 factorial trial designed to investigate the effects of castration and three diets on growth and body composition of 30 male Dorset Horn x (Border Leicester x Merino) lambs is described. The three diets were: (a) a standard ration of equal weights of lucerne chaff and pelleted concentrates; (6) a similar ration to (a) plus 7-5 % by weight of lipid (peanut oil and tallow); (c) a greater ration of (a) calculated to be isocaloric for digestible energy with diet (6).At the beginning of the trial a group of 40 lambs (20 rams, 20 wethers) were shorn and five rams and five wethers were selected at random and slaughtered to establish initial body composition. The remaining 30 lambs, 15 rams and 15 wethers aged about 22 weeks and having mean weights of 33-0 kg (rams) and 31-2 kg (wethers), were randomly divided within sex into three groups and allocated to the three diets for 92 days. At the end of this period the lambs were again shorn, and then slaughtered and dressed.During the trial, rams gained significantly (P < 0-001) more weight than wethers, and lambs on diet (a) gained significantly (P < 0-01) less weight than those on (b) and (c). Weight gains on the latter two diets were similar. Diet generally had little effect on body composition, although there was a tendency, within sexes, for lambs on diet (6) to have a greater fat content than those on the other diets. Rams had significantly greater carcass weights (P < 0-01), head percentage (P < 0-001) and various m. longissimus dorsi dimensions than wethers, but significantly less fat in all the locations measured, including a lower percentage of chemically extractible fat in the offals and carcasses.Estimations of the energy stored in the wool-free body during the trial indicated that wethers stored significantly more energy in the form of fat than rams (P < 0-001), but that rams stored significantly more non-fat energy than wethers (P < 0-001). It is concluded that a maximum growth rate exists for the non-fat body, and that it is higher in rams than wethers. Thus the addition of dietary lipid (which increases energy intake with comparatively small increases in weight or volume of feed), is more likely to promote fat deposition in wethers, which have a lower maximum capacity for non-fat storage, than in rams.

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Section: Body Compositionmentioning

confidence: 79%

Section: Meanmentioning

confidence: 93%

“…This gave a total lipid supplement of 7-5%, compared with the 5% used by Price & Yeates (19716) in obtaining their inconclusive result.…”

Section: Dietsmentioning

confidence: 98%

Section: Meanmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effects of added dietary lipid on the body composition of rams and wethers

Price

1975

J. Agric. Sci.

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The social interactions of young bulls and steers after re-grouping

Tennessen

Price

Berg

1985

Applied Animal Behaviour Science

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Infertile bulls versus steers: III. Carcass characteristics

Price

1971

J. Agric. Sci.

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SummaryThe carcass characteristics of a total of 43 infertile bulls were oompared with those of 42 steers from five independent trials. In most cases there was no significant difference between the bulls and the steers for dressing percentage, or fleshing index. Bulls were generally found to have greater hide percentages than steers, the difference being very highly significant (P < 0·001) in one of the trials and significant (P < 0·05) in another. Eye musole area expressed relative to caroass weight was greater in the bulls, the difference being significant (P < 0·05) in three of the trials. The depth of fat over the eye musole and the hind to fore-quarter weight ratio were greater in the steer carcasses. Head weights were found to be significantly greater (P < 0·05) and caul and kidney fat weights less (P < 0·05) in bulls than in steers in the one trial where these parameters could be measured.Carcass composition was estimated by the three-rib sample joint teohnique in four of the trials, and in these the bulls had a greater percentage of bone and muscle, but a lower peroentage of fat than the steers, the differences being significant in most oases. In the fifth trial composition was estimated by half carcass dissection. This, too, showed bulls to have a greater percentage of bone and muscle and a lower percentage of fat, the differences being highly significant (P < 0·01) and very highly significant (P < 0·001) respectively. On a fat-corrected basis the estimated retail value of the carcasses favoured the bulls by about $20.00 each.The studies, conducted over a range of nutritional conditions, showed that non-castration favoured muscle growth while suppressing fat deposition, and that this advantage was more pronounced when growth rates were high.

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Infertile bulls versus steers: II. Feed conversion efficiency and the effects of a high fat diet

Cited by 4 publications

References 9 publications

The effects of added dietary lipid on the body composition of rams and wethers

The effects of added dietary lipid on the body composition of rams and wethers

The social interactions of young bulls and steers after re-grouping

Infertile bulls versus steers: III. Carcass characteristics

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