Concentrate supplementation on pasture-silage based rations for autumn calving dairy cows
1994
Lanuza A, Francisco | Dumont L, Juan Carlos (Instituto de Investigaciones Agropecuarias, Osorno (Chile). Estacion Experimental Remehue) | Munoz F, Norma
Thirty Friesian autumn-calving dairy cows in their second or later lactation were used in a randomized block design, to evaluate the effect of three levels of concentrate supplementation. 1 kg (Low, L); 3.5 kg (Medium, M) and 6 kg of barley/cow/day (High, H). Animals had ad libitum access to permanent pasture silage, free access to water and minerals and 1 kg/day of grass hay. Cows were housed in individual stalls from the 3rd to the 19th week being the last 12 weeks, the experimental period. The diets were isoproteic (16% CP) by using rapeseed meal in rates 0.5 and 1 kg with animals M and H, respectively. The silage had a mean dry matter content, crude protein, in vitro digestibility, pH, N-NH3 and metabolizable energy of 16.1%, 15.9%, 63.3%, 4.5, 10.6 and 2.25 Mcal/kg of D.M., respectively. The hay dry matter content crude protein, in vitro digestibility were 80.5, 8.8, 57.8%. For silage and hay the metabolizable energy was 2.25 and 1.67 Mcal/kg of D.M., respectively. Mean daily silage intake was 7.9; 7.6 and 7.5 kg of D.M./cow (P 0.05) for L. M and H, respectively and total daily intake of 9.7a; 11.6b and 14.7c kg D.M./cow (P 0.01), 15.2b, 17.9a, 17.9a (P
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