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Net mineral requirements for the growth and maintenance of Somali lambs

Published online by Cambridge University Press:  22 April 2018

E. S. Pereira ,
F. W. R. Lima ,
A. C. N. Campos ,
M. S. S. Carneiro ,
L. P. Silva ,
M. W. F. Pereira ,
A. N. Medeiros ,
L. R. Bezerra  and
R. L. Oliveira Open the ORCID record for R. L. Oliveira [Opens in a new window]
E. S. Pereira
Affiliation:
Animal Science Department, Federal University of Ceara, 2977, Mister Hull Avenue, 60356000 Fortaleza, Ceara, Brazil
F. W. R. Lima
Affiliation:
Animal Science Department, Federal University of Ceara, 2977, Mister Hull Avenue, 60356000 Fortaleza, Ceara, Brazil
A. C. N. Campos
Affiliation:
Animal Science Department, Federal University of Ceara, 2977, Mister Hull Avenue, 60356000 Fortaleza, Ceara, Brazil
M. S. S. Carneiro
Affiliation:
Animal Science Department, Federal University of Ceara, 2977, Mister Hull Avenue, 60356000 Fortaleza, Ceara, Brazil
L. P. Silva
Affiliation:
Animal Science Department, Federal University of Ceara, 2977, Mister Hull Avenue, 60356000 Fortaleza, Ceara, Brazil
M. W. F. Pereira
Affiliation:
Animal Science Department, Federal University of Ceara, 2977, Mister Hull Avenue, 60356000 Fortaleza, Ceara, Brazil
A. N. Medeiros
Affiliation:
Animal Science Department, Federal University of Paraiba, Rodovia PB 079, 58397000 Areia, Paraiba, Brazil
L. R. Bezerra
Affiliation:
Animal Science Department, Federal University of Piaui, Rodovia Bom Jesus-Viana, km 135, 64900000 Bom Jesus, Piaui, Brazil
R. L. Oliveira*
Affiliation:
Veterinary Medicine and Animal Science Department, Federal University of Bahia, 500 Adhemar de Barros Avenue, 40170110 Salvador, Bahia, Brazil
*
†E-mail: [email protected]
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Abstract

Minerals are limiting factors in animal production, and the knowledge of mineral requirements for livestock is crucial to the success of a commercial enterprise. Hair sheep may have different mineral requirements than those presents by the international committees. A study was carried to evaluate the net calcium (Ca), phosphorus (P), magnesium (Mg), sodium (Na), potassium (K), zinc (Zn), iron (Fe), manganese (Mn) and copper (Cu) requirements for the growth and maintenance of Brazilian Somali lambs. A total of 48 hair lambs (13.5±1.8 kg) aged 60±15 days were allocated to individual pens. Eight animals were slaughtered at the beginning of the experiment to serve as a reference group to estimate initial empty BW (EBW) and initial body composition. The remaining lambs (n=40) were assigned to a completely randomized design with eight replications in five levels of metabolizable energy (ME; 4.93, 8.65, 9.41, 10.12 and 11.24 MJ/kg DM). When the lambs of a given treatment reached an average BW of 28 kg, they were slaughtered. Initial body composition was used to calculate the retention of minerals. Mineral body composition was fit using a logarithmic equation in the form of a nonlinear model. The maintenance requirements were estimated from regressions of mineral retention in the empty body on mineral intake. The body mineral concentration decreased in lambs with a BW ranging from 15 to 30 kg. The net mineral requirements (100 g/day of average daily gain (ADG)) decreased from 0.52 to 0.51 g for Ca, 0.28 to 0.23 g for P, 0.02 to 0.02 g for Mg, 0.09 to 0.08 g for Na, 0.11 to 0.09 g for K, 1.30 to 1.08 mg for Zn, 3.77 to 3.22 mg for Fe, 0.08 to 0.06 mg for Mn and 0.09 to 0.08 mg for Cu when BW increased from 15 to 30 kg. The daily net requirements for maintenance per kilogram of BW were 30.13 mg of Ca, 27.58 mg of P, 1.26 mg of Mg, 4.12 mg of Na, 8.11 mg of K, 0.133 mg of Zn, 0.271 mg of Fe, 0.002 mg of Mn and 0.014 mg of Cu. The results of this study indicate that the net mineral requirements for weight gain and maintenance in Brazilian Somali lambs are different than the values that are commonly recommended by the main evaluation systems for feed and nutritional requirements for sheep. These results for the nutritional requirements of minerals may help to optimize mineral supply for hair sheep.

Keywords

growthhair sheepmacromineralsmicromineralssmall ruminant
Type
Research Article
Information
animal , Volume 13 , Issue 1 , January 2019 , pp. 112 - 118
Copyright
© The Animal Consortium 2018 

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