In Sacco Rumen Degradation of Ensiled Maize Cobs Treated with Non Protein Nitrogen (Urea)

Babangida, L.; Nasir, A.; Muhammad, I. R.; Mansur, S. J.; Audu, R.; Bature, N.; Gumel, I. A.; Tijjani, A.; Suleiman, M. R.

Babangida, L. Department of Animal Science, Faculty of Agriculture Federal University Dutse, P.M.B. 7156, Jigawa State, Nigeria
Nasir, A. Department of Animal Science, Faculty of Agriculture, Bayero University Kano, P.M.B., 3011, Kano State, Nigeria
Muhammad, I. R. Department of Animal Science, Faculty of Agriculture, Bayero University Kano, P.M.B., 3011, Kano State, Nigeria
Mansur, S. J. Department of Animal Science, Faculty of Agriculture, Bayero University Kano, P.M.B., 3011, Kano State, Nigeria
Audu, R. Department of Animal Science, Faculty of Agriculture, Bayero University Kano, P.M.B., 3011, Kano State, Nigeria
Bature, N. Department of Animal Science, Faculty of Agriculture Federal University Dutse, P.M.B. 7156, Jigawa State, Nigeria
Gumel, I. A. Department of Animal Science, Faculty of Agriculture Federal University Dutse, P.M.B. 7156, Jigawa State, Nigeria
Tijjani, A. Department of Animal Science, Faculty of Agriculture Federal University Dutse, P.M.B. 7156, Jigawa State, Nigeria
Suleiman, M. R. Department of Agricultural Education, School of Vocational and Technical Education, College of Education, Gumel, P.M.B. 1002, Jigawa State, Nigeria

Keywords: in sacco, rumen degradation, bucks, maize cobs, urea, silage

Abstract

In sacco ruminal degradability is an important measurement in the determination of the nutritive value of feedstuffs. Two experiments were conducted to evaluate the effect of non-protein nitrogen (urea) on the in sacco degradability of maize cobs ensiled for three (3), five (5) and seven (7) weeks. The first experiment was to evaluate the effect of non-protein nitrogen (urea) on the quality of maize cob silage. The experiment was laid out in a completely randomized design (CRD) with three ensiling periods and three replications. The second experiment was to determine the effect of the first experiment on in sacco degradability of treated maize cob silage. In sacco studies were conducted in three fistulated kano brown bucks. Nylon bags containing 4 g of feed sample were inserted in triplicate at each time point in the ventral rumen of each buck for 8, 12, 18, 24, 36, and 48 hrs. The data of rumen feed degradation characteristics were fitted to the equation P = a+b (1-e^-ct) and effective degradability were calculated using a theoretical rumen out flow rate of k= 0.02/hr, k = 0.05/hr and k= 0.08/hr. Results obtained revealed that physical properties of treated maize cob silage were improved with increasing ensiling period from three to seven weeks. Desirable pH (3.22-3.80) was obtained in all silages; while colour and aroma improved significantly (p<0.05) at the 7^th week ensiling period. Silage protein content (10.78%) was significantly (p<0.05) higher at the 7^th week while crude fibre decreased significantly (p<0.05) at the 7^th week of ensiling. The dry matter disappearance and degradability values were greatest at the 7^th week while effective degradability increase with the increasing ensiling times at different outflow rates. Therefore, it was concluded that the physical, nutritional and degradation characteristics of ensiled urea treated maize cobs improved with increase in ensiling period up to the 7^th week.

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