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Title: DEHYDRATED ALFALFA MEAL REDUCES URINARY UREA EXCRETION IN FINISHING GILTS

Author
item Yen, Jong Tseng

Submitted to: Journal of Animal Science Supplement
Publication Type: Abstract Only
Publication Acceptance Date: 2/2/2004
Publication Date: 3/16/2004
Citation: Yen, J. 2004. Dehydrated alfalfa meal reduces urinary urea excretion in finishing gilts [abstract]. Journal of Animal Science 82(Suppl. 2):68.

Interpretive Summary:

Technical Abstract: Reducing urinary urea excretion decreases ammonia emission in pig operations. This study determined effects of dietary inclusion of 10% dehydrated alfalfa meal on urinary urea excretion, growth, and total manure output in finisher gilts. Two groups of four pairs of littermate gilts (83.6 ± 0.9 kg BW) were used. Gilts were housed individually and fed twice daily (0800 and 1500). Daily feed allowance was 2.6× maintenance DE requirement. Feed was mixed with water (1 g per mL) at each feeding. Littermate gilts were assigned to a basal, typical corn-soybean meal finisher diet or a diet containing 10% dehydrated alfalfa meal. The diets were formulated to consist of same amounts of N, GE, Ca, total P, apparent ileal digestible lysine, threonine, tryptophan, and methionine. Gilts were weighed and their daily feed allowance recalculated weekly. On d 14 and again on d 18, each pig was given 2 g of ferric oxide. Total feces were collected between appearances of the first and second red feces. Gilts were fitted with indwelling Foley bladder catheters on d 14. A 96-h total urine collection was started at 1000 on d 15. Gilts were weighed again upon completion of total fecal collection. Results for the basal and the 10% alfalfa meal treatments, respectively were: ADG, 686 and 785 g (P < 0.05); ADFI, 2,495 and 2,594 g (P < 0.05); G/F, 0.28 and 0.30 (P = 0.08); N intake, 56.4 and 55.6 g/d (P = 0.34); urine output, 6,606 and 5,795 mL/d (P = 0.46); urinary urea excretion, 37.3 and 29.1 g/d (P < 0.05); urine N excretion, 23.9 and 20.2 g/d (P < 0.05); wet feces output, 678 and 1,023 g/d (P < 0.01); dry feces weight, 233 and 332 g/d (P < 0.01); feces N excretion, 7.7 and 10.6 g/d (P < 0.01); and total manure output (urine + wet feces), 7,284 and 6,819 g/d (P = 0.68). This study demonstrates clearly that inclusion of 10% dehydrated alfalfa meal in a finisher diet can effectively reduce urine urea excretion and will not increase total manure output in gilts when compared with a typical, corn-soybean meal finisher diet.