NITROGEN BALANCE IN DAIRY GOATS OFFERED NITROGEN SUPPLEMENTS IN ISOCALORIC RATIONS



A.R.S. Asih(1*), B.A. Young(2), S. Baxendel(3), K.G. Wiryawan(4)

(1) Faculty of Animal Husbandry, University of Mataram, Mataram 83125, Indonesia
(2) School of Veterinary Science and Animal Production, The University of Queensland Gatton, QLD, 4345. Australia. E-mail:
(3) Queensland Department of Primary Industries, PO Box 102, Toowoomba QLD, 4350. Australia
(4) Faculty of Animal Husbandry, University of Mataram, Mataram 83125, Indonesia
(*) Corresponding Author

Abstract


Four late lactating Saanen goats were assigned into a Latin Square design eksperiment to evaluate the effectiveness of nitrogen (N) supplements in a high energy ration. The daily rations were 50 % barley hay and 50 % concentrate, based on the amount consumed dming preliminary observations. The concentrate was barley meal (BM), or BM supplemented with either soybean meal (BSBM), cottonseed meal (BCSM) or urea (BU) to provide about 2.7% N and 3 Mcal ME
kg'l DM. The unsupplement BM contained 1.7 % N. The goats were milked once daily and yield and milk nitrogen determined. Total fecal and urine collection was made during the last seven days of each six weeks treatment period. Addition of different N sources to the ration did not increase milk yield or protein content. The N balance in the goats were not significantly different but those receiving the N supplements had higher excretion of N in urine than the BM control. The study indicates that goats producing 1.3 to 1.5 liter of milk per day offered a
concentrate containing 1.7 % N in a high energy diet can maintain similar milk protein and nitrogen balance as those offered 2.2 % N. The excess ofN intake ofthe supplemented diets was excreted in the urine.


Keywords


Nitrogen balance, Dairy goats, Nitrogen sources, Milk yield, Milk protein.

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