Effect of dose and frequency of vitamin A supplements, and carryover effects on plasma carotenoid concentration in steers

Knight, Terry; Death, A. F.

doi:10.1080/00288233.1999.9513387

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…Temperature, pH (penetration electrode) and color (Minolta CR-400 colorimeter) were measured on the Longissimus dorsi muscle, before and after the cooling. Visual score for color was determined by the coordinates L* lightness, a* redness and b* yellowness (KNIGHT & DEATH, 1999). Subsequently, the carcasses were split into two halves, and the left half split into five anatomical regions: neck, shoulder, ribs, loin and leg according to SILVA SOBRINHO (2001).…”

Section: Methodsmentioning

confidence: 99%

“…Temperature and pH were determined using a pH meter with penetration electrode. Color was determined by the coordinates L* lightness, a* redness and b* yellowness using a Minolta CR-400 colorimeter (KNIGHT & DEATH, 1999). To determine weight cooking loss, meat samples were placed over a grill inside trays, weighed, taken to an oven pre-heated at 170ºC, and broiled to an internal temperature of 75ºC.…”

Section: Methodsmentioning

confidence: 99%

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Fresh and matured lamb meat quality fed with sunflower seeds and vitamin E

et al. 2013

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The objective of the study is to evaluate meat quality from Ile de France lamb fed diets supplemented with sunflower seeds and vitamin E. Thirty-two lamb weighing initially 15kg were housed in individual stalls and slaughtered when body weight reached 32kg. The treatments consisted of four experimental diets: D1) sugarcane + concentrate without sunflower seeds; D2) sugarcane + concentrate with sunflower seeds; D3) sugarcane + concentrate without sunflower seeds plus 1000mg vitamin E kg-1 diet dry matter (DM); and D4) sugarcane + concentrate with sunflower seeds and 1000mg vitamin E kg-1 diet DM. The parameters temperature, pH, color, cooking loss, shear force and water holding capacity were determined at maturation times of 0, 7 and 14 days on the Longissimus dorsi muscle. Qualitative characteristics of the meat were not affected by the sunflower seed combined with vitamin E diet; however, pH 24 hours was affected (P<0.05) by the sunflower seed combined with vitamin E diet. Cooking loss was not significantly influenced (P>0.05) by diet or maturation times. On the other hand, shear force and water holding capacity were significantly affected (P<0.05) by the treatments. The use of vitamin E resulted in lamb meat with higher water holding capacity. Maturation time influenced the parameters pH, color and shear force. Lamb meat that matured for 7 days displayed the lowest shear force.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Fresh and matured lamb meat quality fed with sunflower seeds and vitamin E

et al. 2013

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The rate of reduction in carotenoid concentration in fat of steers fed a low carotenoid ration, and the role of increasing carcass fatness

Knight¹,

Death²,

Lambert³

et al. 2001

Aust. J. Agric. Res.

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Experiments were carried out on steers to determine the effects of different allowances of a low carotenoid ration on fat yellowness and the interval from starting on the ration to significant decreases in fat yellowness. In Expt 1, forty 17–18-month-old steers were fed a ration of maize grain, maize silage, and soybean meal containing 6 mg β-carotene/kg DM, and were slaughtered 0, 28, 42, or 70 days after starting on the ration. Significant decreases in fat yellowness and carotenoid concentration in the fat occurred 70 days after starting on the ration. The exception was subcutaneous fat, which had a significant reduction of carotenoid concentration after only 28 days. Decreases in fat yellowness coincided with and were of a similar magnitude to increases in fat deposits. In Expt 2, 3 groups (n = 13) of 24–26-month-old steers were fed a ration of maize grain and pasture silage, which contained 33 mg β-carotene/kg DM. The ration was fed to steers for 63 days at 1 of 3 allowances with the aim of gaining weight rapidly (FASTGN), gaining weight slowly (SLOWGN), or losing weight (WTLOSS). A fourth group of steers (n = 9) was slaughtered at the beginning of the experiment. The growth rates of the steers over the 63 days were 1.72, 0.71, and –0.03 kg/head.day for FASTGN, SLOWGN, and WTLOSS, respectively. Fat yellowness and carotenoid concentration in the fat depots were lower (P < 0.05) for FASTGN than for WTLOSS and steers slaughtered at the beginning of the experiment, with no differences between the latter 2 groups. The SLOWGN were intermediate with higher fat yellowness or carotenoid concentration in some fat depots than for FASTGN and lower than for WTLOSS in other fat depots. In both experiments there were negative correlations between plasma cholesterol (PChol) concentration and fat yellowness and carotenoid concentration, and positive correlations between these traits and plasma carotenoid concentration (PCar). PCar :PChol ratio was a better predictor of fat yellowness and carotenoid concentration than PCar or PChol concentration alone. The conclusions were that reduction in fat yellowness was largely caused by a dilution of existing fat with whiter fat and the rate of change in fat yellowness depended on the rate of fat deposition. The results suggest that carotenoids do not come out of fat once deposited there but further experiments are required to confirm this suggestion.

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Genetic studies of carotenoid concentration in the plasma and milk of New Zealand dairy cattle

Morris

Knight

Newman

et al. 2002

New Zealand Journal of Agricultural Research

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0.11 ± 0.10. The repeatability of plasma CC across seasons was 0.64 ± 0.02. The genetic correlation between spring plasma CC and milk CC g -1 fat was 0.66 ± 0.22, whereas genetic correlation estimates for spring plasma and milk CC g -1 fat with other traits were: with milk volume -0.01 ± 0.16 and 0.41 ± 0.35, with fat yield 0.06 ± 0.22 and 0.29 ± 0.54, and with fat% 0.03 ± 0.13 and -0.26 ± 0.29. It was concluded that plasma CC was a repeatable and heritable trait, whereas milk CC g -1 fat was lowly inherited; plasma CC was essentially uncorrelated with the standard milk production traits; if bulls were selected for lower plasma CC, there would be reduced CC in both the plasma and milk of their daughters.Keywords cattle; carotenoid concentration; heritability; genetic correlation; milk; plasma Abstract Blood and milk samples were collected in 1992/93 from 2-year-old heifers in the Livestock Improvement Corporation's Sire Proving Scheme, for analysis of carotenoid concentration (CC). The trial comprised heifers in 127 spring-calving North Island dairy herds, where blood samples were taken from a total of 2744 heifers (Holstein-Friesians (F), Jerseys (J), and their crosses) in early/mid lactation (spring), and from a sub-group of the same animals in autumn. These heifers were the daughters of 157 young F and J sires, and 15 older sires. Wholelactation yields of milk, fat, and protein, and fat% and protein% were also obtained. Sire-model restricted maximum likelihood (REML) analyses were carried out to estimate genetic and phenotypic parameters. Purebred F and J breed means for plasma CC in spring were 14.1 and 17.9 µg ml -1 (P < 0.001), respectively, and for milk CC 5.24 and 7.50 µg g -1 fat (P < 0.001), and corresponding heritabilities for the two traits were 0.46 ± 0.08 and A01025

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Effect of dose and frequency of vitamin A supplements, and carryover effects on plasma carotenoid concentration in steers

Cited by 3 publications

References 11 publications

Fresh and matured lamb meat quality fed with sunflower seeds and vitamin E

Fresh and matured lamb meat quality fed with sunflower seeds and vitamin E

The rate of reduction in carotenoid concentration in fat of steers fed a low carotenoid ration, and the role of increasing carcass fatness

Genetic studies of carotenoid concentration in the plasma and milk of New Zealand dairy cattle

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