Producing milk with 2.5% fat — the biology and health implications for dairy cows

Kennelly, J. J.

doi:10.1016/0377-8401(96)00974-1

Cited by 17 publications

(9 citation statements)

References 48 publications

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“…Milk gross composition remained unaffected by high-or low-WSC ryegrass forages as has also been observed by Miller et al (2001) and Taweel et al (2005). This confirms that both dried grass types provided sufficient structural property of fibrousness to maintain a high milk fat concentration (Kennelly, 1996), and a sufficient supply of absorbable protein to maintain milk protein synthesis. The latter is confirmed by the calculated positive supply of absorbable protein over requirements.…”

Section: Effects On Animal Performancesupporting

confidence: 78%

Effect of feeding dried high-sugar ryegrass (‘AberMagic’) on methane and urinary nitrogen emissions of primiparous cows

et al. 2012

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Section: Effects On Animal Performancesupporting

confidence: 78%

Effect of feeding dried high-sugar ryegrass (‘AberMagic’) on methane and urinary nitrogen emissions of primiparous cows

et al. 2012

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“…There was no treatment effect for lactose. The greater osmotic effect because of the greater protein content of CLA milk and the high stability of milk osmolality (Jenness, 1985) could have had an effect on lactose, but no difference was observed, in accordance with the usually observed constancy of lactose content (Sutton, 1989;Kennelly, 1996). The large MFD resulted in greater total solids content for the control treatment (P = 0.058), but the difference was small because of the greater protein content of the CLA-treated animals that partly compensated for the lower fat production.…”

Section: Milk Production and Compositionmentioning

confidence: 76%

Effects of dietary supplementation of rumen-protected conjugated linoleic acid to grazing cows in early lactation

Medeiros

Oliveira

Aroeira

et al. 2010

Journal of Dairy Science

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Conjugated linoleic acids (CLA) are potent anticarcinogens in animal and in vitro models as well as inhibitors of fatty acid synthesis in mammary gland, liver, and adipose tissue. Our objective was to evaluate long-term CLA supplementation of lactating dairy cows in tropical pasture on milk production and composition and residual effects posttreatment. Thirty crossbred cows grazing stargrass (Cynodon nlemfuensis Vanderyst var. nlemfüensis) were blocked by parity and received 150 g/d of a dietary fat supplement of either Ca-salts of palm oil fatty acids (control) or a mixture of Ca-salts of CLA (CLA treatment). Supplements of fatty acids were mixed with 4 kg/d of concentrate. Grazing plus supplements were estimated to provide 115% of the estimated metabolizable protein requirements from 28 to 84 d in milk (treatment period). The CLA supplement provided 15 g/d of cis-9,trans-11 and 22g of cis-10,trans-12. Residual effects were evaluated from 85 to 112 d in milk (residual period) when cows were fed an 18% crude protein concentrate without added fat. The CLA treatment increased milk production but reduced milk fat concentration from 2.90 to 2.14% and fat production from 437 to 348 g/d. Milk protein concentration increased by 11.5% (2.79 to 3.11%) and production by 19% (422 to 504 g/d) in the cows fed CLA. The CLA treatment decreased milk energy concentration and increased milk volume, resulting in unchanged energy output. Milk production and protein concentration and production were also greater during the residual period for the CLA-treated cows. The CLA treatment reduced production of fatty acids (FA) of all chain lengths, but the larger effect was on short-chain FA, causing a shift toward a greater content of longer chain FA. The CLA treatment increased total milk CLA content by 30% and content of the trans-10,cis-12 CLA isomer by 88%. The CLA treatment tended to decrease the number of days open, suggesting a possible effect on reproduction. Under tropical grazing conditions, in a nutritionally challenging environment, CLA-treated cows decreased milk fat content and secreted the same amount of milk energy by increasing milk volume and milk protein production.

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“…While the milk fat content of Bunaji cows (4.13 ± 0.122%) was about the standard 4% level, that of N'Dama cows (3.50 ± 0.114%) was lower and the protein and lactose contents of both breeds similar to the 3.4% and 4.8%, respectively, reported as averages for tropical cow milk (Syrstad, 1993/94). The milk (butter) fat contents recorded for the supplemented groups were about 3.7 to 4.0%, which suggests adequate total volatile fatty acids proportions in the rumen (Kennelly, 1996).…”

Section: Discussionmentioning

confidence: 99%

Supplementing Guinea grass with fresh sweet potato foliage for milk production by Bunaji and N'Dama cows in early lactation

et al. 2009

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Producing milk with 2.5% fat — the biology and health implications for dairy cows

Cited by 17 publications

References 48 publications

Effect of feeding dried high-sugar ryegrass (‘AberMagic’) on methane and urinary nitrogen emissions of primiparous cows

Effect of feeding dried high-sugar ryegrass (‘AberMagic’) on methane and urinary nitrogen emissions of primiparous cows

Effects of dietary supplementation of rumen-protected conjugated linoleic acid to grazing cows in early lactation

Supplementing Guinea grass with fresh sweet potato foliage for milk production by Bunaji and N'Dama cows in early lactation

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