dc.contributor.author |
Malleson, Evelyn Rhoda
|
|
dc.contributor.author |
Meeske, R.
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|
dc.contributor.author |
Erasmus, Lourens Jacobus
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|
dc.contributor.author |
Van Niekerk, Willem A.
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|
dc.contributor.author |
Coertze, R.J. (Roelof Johannes)
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|
dc.date.accessioned |
2009-04-15T08:40:17Z |
|
dc.date.available |
2009-04-15T08:40:17Z |
|
dc.date.issued |
2008 |
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dc.description.abstract |
This trial was conducted to test the hypothesis that early lactation cows grazing ryegrass pasture and receiving maize and mineral supplementation could respond to additional supplementation with a protein source such as fish meal. Multiparous Jersey cows in early to mid lactation that grazed annual ryegrass pasture in spring were used in a randomised complete block design experiment. In addition to the pasture, cows received 6 kg (as is) of a maize-based supplement, including minerals, fed in two equal portions in the milking parlour. Three groups of 15 cows received a control, a low fish meal or a high fish meal treatment (0, 4 or 8% fish meal replacing maize). Milk yield was measured and milk samples taken fortnightly. A simultaneous study on rumen fermentation was conducted using eight rumen cannulated cows receiving the control and high fish meal treatments in a cross-over design experiment. Ruminal pH and ammonia-N and volatile fatty acid concentrations were measured. Milk yield, 4% fat-corrected milk yield and milk fat and protein percentages of cows on the low and high fish meal treatments (21.9 and 22.1 kg milk/d, 24.1 and 24.2 kg 4% fat corrected milk/d, 4.73 and 4.67% fat and 3.49 and 3.45% protein) were higher than the control (20.5 kg milk/d, 20.4 kg 4% fat corrected milk/d, 3.97% fat and 3.25% protein). The ruminal ammonia-N concentration was higher in the cows on the high fish meal treatment than the control (16.7 vs. 14.2 mg/dL). Fish meal supplementation to cows on ryegrass proved to be profitable. |
en_US |
dc.identifier.citation |
Malleson, ER, Meeske, R, Erasmus, LJ, Van Niekerk, WA & Coertze, RJ 2008, 'Fish meal supplementation to early lactation Jersey cows grazing ryegrass pasture', South African Journal of Animal Science, vol. 38, no. 4, pp. 331-341. [http://www.sasas.co.za/] |
en_US |
dc.identifier.issn |
0375-1589 |
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dc.identifier.uri |
http://hdl.handle.net/2263/9636 |
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dc.language.iso |
en |
en_US |
dc.publisher |
South African Society for Animal Science |
en_US |
dc.rights |
South African Society for Animal Science |
en_US |
dc.subject |
Cultivated pasture |
en_US |
dc.subject |
RUP |
en_US |
dc.subject |
Maize |
en_US |
dc.subject.lcsh |
Dairy cattle -- Nutrition |
en |
dc.subject.lcsh |
Corn as feed |
en |
dc.subject.lcsh |
Milk yield |
en |
dc.subject.lcsh |
Milk composition |
en |
dc.subject.lcsh |
Fish meal as feed |
en |
dc.subject.lcsh |
Jersey cattle -- Feeding and feeds |
en |
dc.subject.lcsh |
Ryegrasses |
en |
dc.subject.lcsh |
Pastures |
en |
dc.subject.lcsh |
Grazing -- Research |
en |
dc.subject.lcsh |
Lactation |
en |
dc.title |
Fish meal supplementation to early lactation Jersey cows grazing ryegrass pasture |
en |
dc.type |
Article |
en |