TY  - JOUR
T1  - Growth and Feed Efficiency of Pure and F1 Pelibuey Lambs Crossbred with Specialized Breeds for Production of Meat
AU - , G.J. Canton AU - , Q.R. Bores AU - , R.J. Baeza AU - , F.J. Quintal AU - , R.R. Santos AU - , C.C. Sandoval 
JO  - Journal of Animal and Veterinary Advances
VL  - 8
IS  - 1
SP  - 26
EP  - 32
PY  - 2009
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2009.26.32
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2009.26.32
KW  - Lambs
KW  -genotypes
KW  -energy
KW  -growth
KW  -feed efficiency
AB  - Growth and feed efficiency were evaluated for pure and F1 crossbred Pelibuey (Pb) male lambs. Four different genotypes were used: pure PelibueyxPelibuey (PbPb), Black Head DorperxPb (BHDPb), White DorperxPb (WDPb) and KatahdinxPb (KdPb). Thirty six lambs with an average live weight (average&plusmn;SD) of 20.81&plusmn;2.7 kg, were distributed in a randomized block design with a 4x3 factorial arrangement: 4 genotypes and 3 dietary ME concentrations (2.2, 2.5 and 2.8 Mcal kg<SUP>-1</SUP> DM). There were 2 experimental periods, representing the initial (33 days) and final phases (42 days) of lamb fattening. During these 2 phases, 19 and 14.8% dietary crude protein concentration, respectively were used. A higher (p&lt;0.05) DMI, CPI and MEI was observed in the KdPb lambs in comparison with PbPb in the final phase of growth, however not an effect was found (p&lt;0.05) due to the genotype upon the variables in the total growing phase. The ADG, DMI, CPI and MEI observed (average&plusmn;SEM) was 182&plusmn;6 (g animal<SUP>-1</SUP>), 79&plusmn;1.4 and 12.8&plusmn;0.2 (g kg<SUP>-1</SUP> LW<SUP>0.75</SUP>) and 197&plusmn;3.6 (kcal kg<SUP>-1</SUP> LW<SUP>0.75</SUP>), respectively. Lambs fed with 2.8 (Mcal ME kg<SUP>-1</SUP> DM), had (p&lt;0.01) the highest DMI, CPI, ADG and better FG in the initial phase and a highest (p&lt;0.05) ADG in the final stage of growth. The animals fed with a highest levels energy had (p&lt;0.01) a better FG in the whole fattening period (6.5<SUP>a</SUP>, 5.1<SUP>b</SUP> and 4.7<SUP>b</SUP>&plusmn;0.3). No interaction effect (p&gt;0.05) were detected between the genotype and energy level. The genotypes specialized for meat production, expressed a similar ADG and feed efficiency to the pure pelibuey lambs. The best performance for all genotypes was obtained using a 2.8 Mcal ME kg<SUP>-1</SUP> DM diet.
ER  -