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- Title
Energy and protein requirements for maintenance and growth of Boer crossbred kids.
- Authors
Fernandes, M. H. M. R.; Resende, K. T.; Tedeschi, L. O.; Fernandes Jr., J. S.; Silva, H. M.; Carstens, G. E.; Teixeira, I. A. M. A.
- Abstract
Meat production by goats has become an important livestock enterprise in several parts of the world. However, energy and protein requirements of meat goats have not been well defined. The objective of this study was to determine energy and protein requirements for maintenance and growth of 34 intact male crossbred (¾Boer ¼Saanen) from 20 to 35 kg BW. The baseline group (BL) was comprised of seven randomly selected kids, averaging 20 kg BW. An intermediate group was fed ad libitum and consisted of six randomly selected kids that were slaughtered when they reached 27.5 kg BW. The remaining kids (n = 21) were randomly allocated to three levels of DMI (treatments: ad libitum and restricted to 30 and 60% of the ad libitum) within seven groups. A group was slaughtered when the ad libitum treatment kid reached 35 kg BW. Body components were weighed, ground, mixed, and subsampled for chemical analysis. Initial body composition was determined using equations developed from the composition of the BL kids. The diet DM consisted of 47% corn hay and 53% concentrate (21.4% CP). A digestion trial was conducted in parallel to determine dietary DE and ME. The NEmcalculated was 77.3 ± 1.05 kcal/kg0.75 EBW (67.4 ± 1.04 kcal/kg0.75 BW). The ME for maintenance (MEm; 118.1 kcal/kg0.75 EBW) was calculated by iteration assuming heat produced is equal to ME intake at maintenance. Therefore, the partial efficiency of use of ME to NE for maintenance was 0.65. A value of 391 ± 59 mg N/d/kg0.75 EBW for N losses (or 2.44 ± 0.4 g of NPm/d/kg0.75 EBW) was determined. Net energy (NEg) and protein (NPg) requirements for growth ranged from 2.55 to 3.0 Mcal/kg empty weight gain (EWG) and 178.8 to 185.2 g/kg EWG for 20 and 35 kg BW; respectively. These findings suggested that net energy and protein requirements for growth of Boer crossbreds, a meat type breed, might be higher than published requirements for dairy goats. * Sponsored by FAPESP and CAPES, Brazil.
- Subjects
BRAZIL; GOATS; BODY composition; TECHNICAL specifications; WEIGHT gain; GOAT diseases; DAIRY processing
- Publication
Journal of Animal Science, 2006, Vol 84, p25
- ISSN
0021-8812
- Publication type
Article