Carotenoids and vitamin A in the blood of the bovine

McGillivray, W. A.

doi:10.1080/00288233.1960.10419308

Cited by 4 publications

(4 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mean plasma CC values of 16.1 |ag ml 1 in spring and 12.5 |ag ml" 1 in autumn in heifers in this study were similar to concentrations found by McGillivray (1957McGillivray ( ,1960b for pasture-fed cows in spring and autumn. Higher plasma CC in J than F heifers was consistent with earlier reports of differences between these breeds (McGillivray 1960a;Morgan et al 1969).…”

Section: I-isupporting

confidence: 67%

“…These differences in plasma CC between breeds were reflected in the CC in milkfat; least squares means for concentrations in J (7.5 \ig g^1 fat) and F (5.2 |jg g" 1 fat) heifers were similar to those found in J and F heifers by Winkelman et al (1999) at similar stages of ssft Sft S lactation. Concentrations of CC in milkfat in this study were lower than those reported for samples of bulk milk taken from dairy factories in the Manawatu and Taranaki provinces over the October-December period (Keen & Wilson 1992) and for earlier reported concentrations (McGillivray 1957(McGillivray , 1960b). These differences may reflect cow-age effects, since heifers have lower plasma CC than mature cows (McGillivray 1960b).…”

Section: I-icontrasting

confidence: 50%

“…Concentrations of CC in milkfat in this study were lower than those reported for samples of bulk milk taken from dairy factories in the Manawatu and Taranaki provinces over the October-December period (Keen & Wilson 1992) and for earlier reported concentrations (McGillivray 1957(McGillivray , 1960b). These differences may reflect cow-age effects, since heifers have lower plasma CC than mature cows (McGillivray 1960b). The high phenotypic correlation for plasma CC in blood samples collected in spring and autumn (0.69) agrees with earlier reports of the consistent ranking of heifers in a group on plasma CC even when there were large changes in the carotenoid intake of the group .…”

Section: I-icontrasting

confidence: 50%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

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

show abstract

Section: I-isupporting

confidence: 67%

Section: I-icontrasting

confidence: 50%

Section: I-icontrasting

confidence: 50%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

show abstract

“…These steers may have had higher reserves of carotenoids in their fat depots when t h e trial commenced, a different rate of mobilisation of the carotenoids from the fat, or a greater ability to absorb more carotenoids from the diet. McGillivray (1960) and Morgan et al (1969) reported marked fat colour variations within, as well as between, breeds. Further work is required to detect such cattle to avoid extended periods of grain feeding just to improve their fat colour.…”

Section: Concentrations Of P-carotene and Lutein Significantlymentioning

confidence: 94%

Effect of grain feeding on fat colour and other carcass characteristics in previously grass-fed Bos indicus steers

Strachan¹,

Yang²,

Dillon³

1993

Aust. J. Exp. Agric.

View full text Add to dashboard Cite

One hundred Brahman cross steers were Subcutaneous fat depth at 105 and 175 days (17.3 mm) removed from pasture and fed a high grain diet for a was greater than at 35 and 70 days (14.5 mm) and finishing period of 0, 35, 70, 105, or 175 days. The significantly (P<0.05) greater than at the initial steers were then slaughtered and assessed for slaughter (12.5 mm). subcutaneous fat depth, fat colour, meat colour, Fat colour was correlated (in the subcutaneous and marbling, and p-carotene and lutein concentrations in intermuscular fat, respectively) with p-carotene the fat and serum.(r = 0.61 and 0.55) and lutein (r = 0.53 and 0.52) The average liveweight gain was 0.7 kg/day. After concentrations, and in the serum, with p-carotene 35 days of grain feeding, fat colour was significantly (r = 0.49) concentration. Objective assessment of fat (Pc0.05) decreased from 3.9 to 2.4 when assessed using colour, the Minolta b* value, was also correlated (in the grading chips ranging from 0 (polar white) to 9 (creamy subcutaneous and intermuscular fat, respectively) with yellow). There was a trend to a further decline in fat p-carotene (r = 0.85 and 0.80) and lutein (r = 0.74 and colour over longer finishing periods (1.7 at 105 days 0.73) concentrations and was correlated with p-carotene and 2.0 at 175 days), although 1 steer had a fat colour (r = 0.61) concentrations in the serum. It was score of 6 at 70 days and 1 at 105 days slaughter, and demonstrated that grain feeding had an effect on another had a score of 4 at 175 days. Steers fed for changing bovine fat colour, and although p-carotene was 175 days had higher marbling but darker meat than predominant in serum, both p-carotene and lutein those fed for the other finishing periods (P<0.05). contributed to the yellowness in bovine carcass fat.

show abstract

Carotenoids and vitamin A in the blood of the bovine

Cited by 4 publications

References 18 publications

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

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

Effect of grain feeding on fat colour and other carcass characteristics in previously grass-fed Bos indicus steers

Section D. Nutritive value of milk and milk products: Part 1. Nutritive value of milk for man, and fat-soluble vitamins in milk

Contact Info

Product

Resources

About