Abstract

This experiment

compared four balanced diets in which different percentages

of 84-day-old fresh mulberry dry matter (0%, 20%, 40% and

60%) substituted its equivalent of dry matter in the concentrate.

The total intake of dry matter varied between 3.12%

and 3.24% in relation to live body weight (BW). No significant

differences were observed (P≥0.05) in the total consumption

of dry matter among cows with the same trial. In

the ration without mulberry (0%), forage made up 42% of the

total dry matter intake and in the 60% mulberry ration, 86%.

The intake of mulberry was close to 2%/BW in the 60% ration.

The substitution ratio was 677 g/animal/day of concentrated

dry matter per kg of mulberry dry matter added to the

diet, in addition to the substitution of 323 g/animal/day of

black sorghum and soybean mix. The protein replaced was

576 g/animal/day of concentrate and 424 g/animal/day of

black sorghum and soybean mix per each kg of mulberry crude

protein. Each megacalorie of digestible energy of mulberry

added to the diet, substituted 0.675 mcal/animal/day of

energy in the concentrate feed and 0.325 mcal/animal/day of

the black sorghum and soybean mix. Significant differences

(P<0.05) appeared among the four different levels of added

mulberry in relation to the live body weight of the cattle and

in their daily milk production. Within the same diet there were

no differences (P>0.05) between the initial and final body

weight of the animals and the variations in daily milk production

were small.