| Full text | |
| Author(s): |
Figueiredo, F. O. M.
;
Leite, R. F.
;
St-Pierre, N. R.
;
Resende, K. T.
;
Almeida, A. K.
;
Souza, A. P.
;
Teixeira, I. A. M. A.
Total Authors: 7
|
| Document type: | Journal article |
| Source: | JOURNAL OF ANIMAL PHYSIOLOGY AND ANIMAL NUTRITION; v. 101, n. 5, p. 1014-1025, OCT 2017. |
| Web of Science Citations: | 5 |
| Abstract | |
The objective of this research was to estimate the energy and protein requirements for maintenance and growth in male (castrated and intact) and female Saanen goat kids between 15 and 30kg BW. To determine the net energy requirements for maintenance (NEm) and the net protein requirements for maintenance (NPm), 75 goats (25 castrated and 26 intact males and 24 females) were used. Twenty-one goats (seven castrated and eight intact males and six females) were randomly assigned for slaughter to estimate the initial empty body composition. The 54 remaining animals (18 castrated and 18 intact males and 18 females) were randomly assigned in a split-plot design using a 3x3 factorial arrangement with three sexes and three levels of intake (adlibitum and restricted feed to 75% or 50% of the adlibitum intake). Within each sex, six blocks (three goats per block) were formed and one goat was randomly assigned to each level of intake. The 75% and the 50% of adlibitum rationing were determined daily, based on the DMI of the animal fed adlibitum on the previous day. All animals within block were slaughtered when the animal fed adlibitum reached 30kg BW. The net energy requirements for gain (NEg) and the net protein requirements for gain (NPg) were obtained using 58 animals (20 castrated and 20 intact males and 18 females). The animals were fed adlibitum and slaughtered at targeted BW (15, 23 or 30kg). Sex did not affect NEg and NPm (277.8kJ/kg(0.75)BWday and 2.98gCP/kg(0.75)BWday respectively), as well as NPg (180.9 +/- 6.48 g/kgEBW gain) in Saanen goat kids. However, castrated males and females had similar NEg (varied from 12.6 +/- 0.424 to 17.9 +/- 1.38MJ/kg EBW gain), greater than intact males (varied from 9.74 +/- 0.420 to 10.7 +/- 0.984MJ/kg EBW gain), as the BW increased from 15 to 30kg. (AU) | |
| FAPESP's process: | 08/58351-5 - Metabolism, nutritional, requirements and carcass traits of growing goats |
| Grantee: | Kléber Tomás de Resende |
| Support type: | Research Projects - Thematic Grants |