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Abstract
The present study was performed in order to evaluate the effect of genotype of lamb and Biogen® treatment in both genotypes on growth and blood parameters during a 10 week fattening period. For this purpose, eighty male lambs, 40 lamb purebred Barki and 40 crossbred (Barki X Ossimi) lambs. Within each genotype, 20 male lambs were supplemented with Biogen and the remaining 20 were non-supplemented as a control. Measurements of body weights and body dimensions were recorded biweekly. In addition, blood samples were collected twice; at the 4th and 8th weeks for some serological and hematological parameters. The following results were obtained.
• Body weight was differing significantly by the genotype of lambs. The control crossbred lambs were significantly heavier than purebred Barki lambs starting from the 4th week of the fattening period till the end of the experiment (49.73 ± 0.75 kg) vs. (44.73 ± 0.83 kg) for crossbred and pure Barki lambs respectively.
• Control crossbred lambs showed significant difference in (ADG) higher than control Barki lambs during the period from 6th - 8th week of the experiment (200 ± 0.02g) for control crossbred lambs and (46.4 ± 0.02g) for control Barki lambs. However, Biogen supplemented crossbred lambs grew at a significantly faster rate (361 ± 0.05g/day) than did non supplemented control (243 ± 0.04g/day) between the 2nd and 4th weeks. On the other hand, the reverse occurred between 6th and 8th weeks, where a significant difference of (117.9 g/day) was observed in favor of control crossbred lambs. However, purebred Barki fed Biogen had a significantly faster growth between 6th and 8th weeks (128.6 ± 0.03 vs. 46.4 ± 0.20 g/day); but at a lower rate between 8th and 10th weeks (296.4 ± 0.4 vs. 482.1 ± 0.05 g/day). On the other hand, throughout the experiment (initial to final weeks) ADG was not statistically not significant between Biogen treated and non-treated lambs in both genotypes.
• Control crossbred lambs showed significant difference (6.53±0.06%) higher than control Barki lambs (1.77±0.73%) in (RGR) during the period from 6th -8th week of the experiment however, during the period from 8th -10th week of the experiment control crossbred lambs showed significant difference (12.29±1.01%) lower than control Barki lambs (15.87±1.3%). However, Biogen-treated crossbred lambs were significantly differing lower from non- treated crossbred lambs during the period from 6th-8th week of the experiment (2.73 ± 1.09% vs. 6.58 ± 0.61%). however, during the period from 8th-10th week of the experiment Biogen-treated crossbred lambs showed significantly difference higher than non-treated crossbred lambs (15.14 ± 0.71% vs. 12.29 ± 1.01%).
• Genarlly, crossbred lambs had longer body measurements than purebred Barki lambs. Crossbreds had significantly higher body length than purebred Barki lambs started at 6th week of the experiment and continued till the end of the experiment (69.83± 0.7 cm) vs. (67.28 ± 0.56 cm); more body height from the 2nd week of the experiment till the end (65.9 ± 0.42 cm) vs. (64.23 ± 0.4 cm); wider tubercoxae distance from the 2nd week of the experiment (61.75cm ± 0.63) vs. (59.9cm ± 0.48) till the end of the experiment (66.75cm ± 0.5) and (63.85cm ± 0.56) for crossbred and Barki lambs; longer cannon bone during the period of 6th and 8th week of the fattening period (15.25 ± 0.2 cm and 15.48 ± 0.22 cm) vs. (14.55± 0.18 cm and 14.88 ± 0.14 cm), and large cannon bone circumference after 2 weeks (8.78 ±0.13 cm) vs. (8.45 ± 0.09 cm). On the other hand, Biogen treated pure Barki lambs had significantly greater body length than non Biogen treated pure Barki lambs during the 2nd and 4th week of the experiment (63.6 ± 0.64 cm and 65.05 ± 0.54 cm) vs. (60.8 ± 0.76 cm and 62.8 ± 0.73 cm) respectively, moreover, treated Biogen Barki lambs showed higher significant difference in body height than non Biogen treated Barki lambs during the 2nd