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Journal of Animal Science, Vol 69, Issue 5 2020-2025, Copyright © 1991 by American Society of Animal Science

JOURNAL ARTICLE

Nitrogen requirement of pregnant gilts

J. M. Dunn and V. C. Speer
Dept. of Anim. Sci., Iowa Agriculture and Home Economics Experiment Station, Ames 50011.

Eleven Yorkshire x Landrace gravid gilts were used in two Latin square trials to determine the N requirement for pregnancy. Semipurified diets were formulated to be adequate in indispensable amino acids (IAA) and other nutrients. Diets were fed once daily (1.82 kg); L-glutamic acid, corn sugar, powdered cellulose, and soybean oil percentages differed to maintain isocaloric diets. In Trial 1, six gilts were fed diets containing 6.6 to 17.2% CP equivalent (19.2 to 50.1 g of N/d) during six 10-d periods beginning on d 40 postcoitum. In Trial 2, five gilts were fed diets containing 4.3 to 12.6% CP equivalent (12.5 to 36.8 g of N/d) during five 10-d periods beginning on d 50 postcoitum. Nitrogen balance trials were conducted during the last 5 d of each period. Blood samples were taken both before and 3 h after the last feeding of each period. Results from Trial 1 suggested that adequate N retention (10 g/d) could be attained by pregnant gilts fed less than 28 g of N/d intake when the diet contained indispensible amino acids at levels suggested by Nutrient Requirements of Swine (NRC, 1988). An intake of 20.6 g of N/d (7.1% CP equivalent) yielded near maximum N retention among pregnant gilts fed the semipurified diets in Trial 2. Other criteria measured (urine urea nitrogen and plasma urea nitrogen) had limited value in the evaluation of the N status of the pregnant gilts in these trials.


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R. A. Kohn, M. M. Dinneen, and E. Russek-Cohen
Using blood urea nitrogen to predict nitrogen excretion and efficiency of nitrogen utilization in cattle, sheep, goats, horses, pigs, and rats
J Anim Sci, April 1, 2005; 83(4): 879 - 889.
[Abstract] [Full Text] [PDF]


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Copyright © 1991 by the American Society of Animal Science.