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The effect of red clover proportion in timothy silage on nitrogen utilization in lactating dairy cows

Steinshamn, Håvard; Mydland, Liv Torunn; Volden, Harald and Thuen, Erling (2006) The effect of red clover proportion in timothy silage on nitrogen utilization in lactating dairy cows. In: Wachendorf, Michael; Helgadóttir, Áslaug and Parente, Giuseppe (Eds.) Sward Dynamics, N-flows and Forage Utilisation in Legume-Based Systems, ESA-Azienda regionale per lo sviluppo rurale, Via Montesanto, 15/6, 34170 Gorizia, Italy, pp. 293-297.

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Summary

Three multiparous cannulated dairy cows were used to test the effect of including 0, 23 % and 46 % red clover (RC) on dry matter (DM) basis in timothy (T) silage on nitrogen (N) intake, utilization and excretion. The cows were offered a fixed ration; 13 kg silage and 7 kg concentrate DM. The N intake and urine N excretion increased with increasing silage clover proportion. Milk yield was higher in the clover containing silages than in the pure grass silage, probably due to higher organic matter digestibility in RC containing silages. The efficiency in converting feed N into milk N, however, was higher in cows fed the timothy silage than in cows offered grass/clover silages. The efficiency in microbial protein synthesis in the rumen and the proportion of microbial N of the total N flow to duodenum was higher on the T diet than on the RC containing diets. However, the clover diets gave a slightly higher proportion of bypass N originating from the feed. So, the total flow of N to duodenum was the same for all three diets. In conclusion, increased proportion of RC in T silage did not improve the N utilization.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:Dairy cow, Trifolium pratense, Phleum pratense, silage, nitrogen utilization
Subjects: Animal husbandry > Production systems > Dairy cattle
Research affiliation: Norway > NORSØK - Norwegian Centre for Ecological Agriculture
Norway > UMB - Norwegian University of Life Sciences
Deposited By: Steinshamn, Dr Håvard
ID Code:9316
Deposited On:02 Apr 2007
Last Modified:12 Apr 2010 07:34
Document Language:English
Status:Published
Refereed:Not peer-reviewed
Additional Publishing Information:The forage was conventionally produced. However, the legume treatments in this experiment are relevant for organic dairy production.

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