Cercetari cu privire la normele de energie si de proteina la caprine.
1993
Voicu I. | Burlacu G. | Voicu D. | Criste R.D.
The authors studied the energy and protein metabolism in pregnant and lactating goats, as well as in growing female kids up to 8 months of age, in order to determine the efficiency of feed utilisation and the energy and protein requirements for these animal categories. The following results were obtained: the utilisation of the energy and protein derived from feeding diets including alfalfa hay, oats hay, wheat bran, and mixed feed (for suckling kids) was different among the categories of animal under study, depending on animal physiological condition and age. Thus, pregnant goats used 21 percent of the metabolizable energy (ME) as net energy for pregnancy (foetus plus foetal membranes), with the energy requirement for maintenance at 0.400 MI/kg 0,75. A proportion of 41.2 + or - 3.1 percent of the intestinal digestible protein (PDI) was used for pregnancy, with protein requirements for maintenance estimated at 2.32 g PDI/kg 0.75. Lactating goats used 60.7 + or - 5 percent of the metabolizable energy as net energy for milk production (NEm); PDI wwas used in proportion of 58.9 + or - 4 percent. The energy and protein requirements for maintenance were assumed to be similar to those for pregnant goats. Growing kids had daily net gains ranging between 124 and 60 g. The protein content of the gain ranged between 23 g (month 2) and 12 g (month 8) while the fat content varied between 8 g (month 1) and 24 g (month 6). The energy requirement for maintenance was 0.450 MJ ME/kg 0.75; its net efficiency for growth 46.2 + or - 3 percent. The PDI requirement for maintenance was 2.42 g PDI/kg 0.75; its efficiency for the protein gain (retained protein) was 50.1 + or - 2 percent.
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