The effect of strategic supplementation with trans-10,cis-12 conjugated linoleic acid on the milk production, estrous cycle characteristics, and reproductive performance of lactating dairy cattle

Dietary conjugated linoleic acid (CLA) supplements have been shown to reduce milk fat synthesis in dairy cows. A rumen-inert source of CLA is required for commercial feed applications. The conversion of dietary lipids to a calcium salt is considered as a method to counter the extensive hydrogenation of dietary lipids that occurs in the rumen. Our objective was to determine whether feeding calcium salts of CLA under commercial conditions would affect milk production, milk composition and blood metabolic profile. A total of 240 dairy cows from eight farms were blocked according to the calving date, and randomly assigned to four treatments providing CLA at 0, 8, 16 and 32 g d-1. Milk production was recorded and milk was sampled on day 0, 7, 14, 28 and 42 of the feeding period. Blood samples were taken on day 42 from early-lactating cows (< 157 d in milk) to determine the metabolic profile. Milk fat yield was decreased 11, 20 and 28%, and milk fat concentration was reduced 13, 22 and 28% (linear; P < 0.001) when cows received 8, 16 and 32 g d-1 of CLA, respectively. Milk yield, milk protein and blood metabolic parameters were not affected by experimental treatments. Calcium salts of CLA can be used as an effective tool to manage milk fat content on commercial dairy farms. Key words: Conjugated linoleic acid, milk fat, ruminally inert fat

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Reproductive performance of lactating dairy cattle after intrauterine administration of a prostaglandin F2α receptor antagonist 4 days after insemination

Theriogenology ◽

10.1016/j.theriogenology.2014.10.019 ◽

2015 ◽

Vol 83 (4) ◽

pp. 560-566 ◽

Cited By ~ 1

Author(s):

S.E. Deaver ◽

A.M. Felix ◽

M.L. Rhoads

Keyword(s):

Dairy Cattle ◽

Receptor Antagonist ◽

Reproductive Performance ◽

Prostaglandin F2α ◽

Lactating Dairy Cattle

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Production characteristics of the Jamaica Hope breed of dairy cattle

The Journal of Agricultural Science ◽

10.1017/s002185960001755x ◽

1970 ◽

Vol 74 (3) ◽

pp. 463-468 ◽

Cited By ~ 5

Author(s):

K. E. Wellington ◽

P. Mahadevan ◽

K. L. Roache

Keyword(s):

Dairy Cattle ◽

Milk Production ◽

Milk Yield ◽

Reproductive Performance ◽

Production Performance ◽

Tropical Environment ◽

Calving Interval ◽

Considerable Potential ◽

Production Characteristics

SUMMARYThis study is the first comprehensive estimation of breed parameters for the Jamaica Hope breed of dairy cattle. It has shown that the breed has considerable potential for milk production undser good husbendry in a tropical environment. Improvements in reproductive performance may be achieved, without prejudice to production performance, by using milk yield per day of calving interval (which has a moderatoly high repestability) as a criterion for selection.

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Changes in estrogen-α receptor immunoreactivity during the estrous cycle in lactating dairy cattle

Brain Research ◽

10.1016/s0006-8993(00)02870-5 ◽

2000 ◽

Vol 880 (1-2) ◽

pp. 219-223 ◽

Cited By ~ 11

Author(s):

Frank J.C.M. van Eerdenburg ◽

Ineke A.J.J.M. Daemen ◽

Eline M. van der Beek ◽

Fred W. van Leeuwen

Keyword(s):

Dairy Cattle ◽

Estrous Cycle ◽

Lactating Dairy Cattle

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The effect of fodder beet inclusion on milk production and nitrogen and energy utilization of grass silage based diets by lactating dairy cattle

Proceedings of the British Society of Animal Science ◽

10.1017/s1752756200003872 ◽

2001 ◽

Vol 2001 ◽

pp. 5-5 ◽

Cited By ~ 2

Author(s):

D.G. McIlmoyle ◽

D.C. Patterson ◽

D.J. Kilpatrick

Keyword(s):

Dairy Cattle ◽

Dairy Cows ◽

Milk Production ◽

Milk Yield ◽

Previous Experiment ◽

Energy Utilization ◽

Fodder Beet ◽

Grass Silage ◽

Metabolisable Energy ◽

Lactating Dairy Cattle

In a previous experiment with dairy cows at this Institute, in which fodder beet was included as a third component of the diet along with grass silage and concentrate, fodder beet considerably increased metabolisable energy intake (MEI), but there was little effect on milk yield (unpublished data). The main objectives of the present study were to examine the effects of including fodder beet versus concentrate in a grass silage diet, on milk production, digestibility of nutrients and the utilization of nitrogen (N) and energy at equal ME intake in lactating dairy cattle.

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