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Abstract
The experimental work of this study was carried out on Ossimi and Ossimi–Rahmani crossbred male lambs. These lambs belonged to the herd raised in the Experimental Farm of the Faculty of Agriculture at Moshtohor, Banha University.
Twenty-four pure Ossimi and thirty crossbred male lambs (resulting from mating between Ossimi and Rahmani sheep) produced during the period of the study were fattened for three months. Fattening started when male lambs reached five, seven and nine months of age, lambs of fattening groups was assigned form all the weaned lambs at random. Wheat straw and Egyptian clover were offered ad libitum while the concentrate mixture was allowed according to National Research Council N.R.C. (1985) recommendation based on the animal live body weight. Body dimensions measured were body length, height at withers, heart girth, chest width, chest depth and width at hind quarter. At the end of the fattening period six (three Ossimi and three crossbred) male lambs from each of the fattened groups (i.e. five, seven and nine months of age) were slaughtered for carcass evaluation. Blood samples were taken when the lambs reached five, seven and nine months of age.
The results obtained in this study can be summarized as follows:
1. Fattening experiment
1.1. Body weight: Ossimi-Rahmani crossbred lambs had the best results in body weight was 38.92, 44.25 and 49.18 kg than Ossimi lambs was 38.87, 44.05 and 48.83 kg at first, second and third month of fattening, respectively. The differences between means of male lambs body weight, due to breed group Ossimi and Ossimi-Rahmani crossbred lambs effect, was in-significant.
Single lambs had high body weight was 38.97, 44.21 and 49.02 kg than twin lambs was 38.81, 44.08 and 48.98 kg at first, second and third month of fattening, respectively. The differences between means of lambs body weight, due to type of birth effect, was in-significant.
Lambs born for ewes at third parity had the higher body weight was 39.34, 44.57 and 49.36 kg than lambs born for ewes at first parity was 38.09, 43.39 and 48.48 kg and second parity was 39.25, 44.48 and 49.17 kg at first, second and third month of fattening, respectively. The differences between means of male lambs body weight, due to parity effect, was non-significant.
Lambs that started fattening at 9 months of age had a high body weight was 51.07, 55.99 and 60.45 kg than lambs that started fattening at 5 months of age was 29.40, 35.03 and 40.41 kg and lambs that started fattening at 7 months of age was 36.21, 41.42 and 46.15 kg at first, second and third month of fattening, respectively. The differences between means of male lambs body weight, due to age at start of fattening effect, was highly significant (P<0.001) at first, second and third months of fattening period.
1.2. Daily gain: Ossimi-Rahmani crossbred lambs had higher daily gain was 186.86, 177.84 and 164.48 g/day than Ossimi lambs was 181.98, 172.86 and 159.61 g/day during first, second and third month of fattening, respectively. The differences between means of male lambs daily gain, due to breed group effect, was non-significant.
Single lambs had high daily gain was 184.97, 175.87 and 163.63 g/day than twin lambs was 183.86, 174.83 and 160.47 g/day during first, second and third month of fattening, respectively. The differences between means of male lambs daily gain, due to type of birth effect, was non-significant.
Lambs born for ewes at first parity had the higher daily gain was189.05, 176.79 and 169.90 g/day during first, second and third month of fattening, respectively, and followed by lambs born for ewes at second parity was 189.11 g/day during first month of fattening and decreased to 174.48 and 156.50 g/day during second and third month of fattening, respectively, but lambs born for ewes at third parity was the lower in daily gain during first month of fattening was 180.38 g/day and decreased to 174.77 and 159.75 g/day during second and third month of fattening, respectively. The differences between means of male lambs daily gain, due to parity effect, was non-significant.
Lambs that started fattening at 5 months of age had a high daily gain was 187.81 and 179.65 g/day during second and third months of fattening, respectively, than lambs that started fattening at 7 months of age was 173.75 and 157.96 g/day and lambs that started fattening at 9 months of age was 164.48 and 148.53 g/day but during first month of fattening lambs that started fattening at 7 months of age had a high daily gain was 189.11 g/day than lambs that started fattening at 5 months of age was 187.71 g/day and lambs that started fattening at 9 months of age was 176.42 g/day. The differences between means of male lambs daily gain, due to age at start of fattening effect, was significant at second (P<0.05) and third ( P<0.01) months of fattening period.
1.3. Weight gain: Ossimi-Rahmani crossbred lambs had higher weight gain was 5.60, 5.32 and 4.92 kg than Ossimi lambs was 5.45, 5.17 and 4.78 kg during first, second and third month of fattening, respectively. The differences between means of male lambs weight gain, due to breed group effect, were non-significant.
Single lambs had high weight gain was 5.54, 5.26 and 4.90 kg than twin lambs was 5.51, 5.23 and 4.81 kg during first, second and third month of fattening, respectively. The differences between means of male lambs weight gain, due to type of birth effect, were non-significant.
Lambs born for ewes at first parity had the higher weight gain was 5.66 kg during first month of fattening than lambs born for ewes at second parity was 5.50 kg and lambs born for ewes at third parity was 5.40 kg but during second and third month of fattening weight gain was higher in lambs born for ewes at first parity was 5.29 and 5.08 kg than lambs born for ewes at third parity was5.23 and 4.78 kg and followed by those born for ewes at second parity was 5.22 and 4.69 kg. The differences between means of male lambs weight gain, due to parity effect, were non-significant.
Lambs that started fattening at 7 months of age had a high weight gain was 5.67 kg during first month of fattening than lambs that started fattening at 5 months of age was 5.62 kg and followed by those started fattening at 9 months of age was 5.28 kg but during second and third month of fattening lambs that started fattening at 5 months of age had a high weight gain was 5.63 and 5.37 kg than lambs that started fattening at 7 months of age was 5.20 and 4.37 kg and followed by those started fattening at 9 months of age was 4.92 and 4.45 kg. The differences between means of male lambs weight gain, due to age at start of fattening effect, was significant at second (P<0.05) and third (P<0.01) months of fattening period.
1.4. Total feed intake: Ossimi-Rahmani crossbred lambs had higher total feed intake was 32.47, 35.35 and 38.95 kg than Ossimi lambs was 32.26, 35.35 and 38.90 kg during first, second and third month of fattening, respectively. The differences between means of male lambs total feed intake, due to breed group effect, was non-significant.
Single lambs had high total feed intake was 32.71 kg than twin lambs was 32.02 kg during first month of fattening but during second and third month of fattening twin lambs had high total feed intake was 35.39 and 39.27 kg than single lambs was 35.30 and 38.58 kg, respectively. The differences between means of male lambs total feed intake, due to type of birth effect, was non-significant.
Lambs born for ewes at third parity had the higher total feed intake was 32.93 kg than lambs born for ewes at second parity was 32.60 kg and lambs born for ewes at first parity was 31.56 kg during first month of fattening but during second month of fattening total feed intake was high in lambs born for ewes at first parity 35.45 kg than lambs born for ewes at third parity 35.33 kg and lambs born for ewes at second parity 35.27 kg while, during third month of fattening total feed intake was higher in lambs born for ewes at third parity 39.03 kg than lambs born for ewes at first parity 38.95 and lambs born for ewes at second parity 38.80 kg. The differences between means of male lambs total feed intake, due to parity effect, was non-significant.
Lambs that started fattening at 9 months of age had a high total feed intake was 39.84, 42.65 and 45.08 kg during first, second and third month of fattening, respectively, than lambs that started fattening at 7 months of age was 30.54, 33.38 and 38.19 kg and followed by lambs that started fattening at 5 months of age was 26.71, 30.01 and 33.51 kg. The differences between means of male lambs total feed intake, due to age at start of fattening effect, was significant at first, second and third (P<0.01) months of fattening period.
1.5. Feed conversion: Ossimi lambs had higher feed conversion was 5.98, 6.94 and 8.34 feed/gain during first, second and third month of fattening, respectively, than Ossimi-Rahmani lambs was 5.87, 6.75 and 8.03 feed/gain. The differences between means of male lambs feed conversion, due to breed group effect, was non-significant.
Single lambs had high feed conversion was 6.03, 6.87 and 8.25 feed/gain during first, second and third month of fattening, respectively, than twin lambs was 5.82, 6.82 and 8.12 feed/gain. The differences between means of male lambs feed conversion, due to type of birth effect, was non-significant.
Lambs born for ewes at third parity had the higher total feed conversion was 6.01 and 8.41 feed/gain than lambs born for ewes at second parity was 6.01 and 8.39 feed/gain and lambs born for ewes at first parity was 5.64 and 7.74 feed/gain during first and third month of fattening, respectively, but during second month of fattening lambs born for ewes at second parity had the higher feed conversion 6.87 feed/gain than lambs born for ewes at third parity 6.86 feed/gain and lambs born for ewes at first parity 6.80 feed/gain. The differences between means of male lambs feed conversion, due to type of birth effect, was non-significant.
Lambs that started fattening at 9 months of age had a high total feed conversion was 7.57, 8.72 and 10.27 feed/gain during first, second and third month of fattening, respectively, than lambs that started fattening at 7 months of age was 5.42, 6.43 and 8.14 feed/gain and followed by lambs that started fattening at 5 months of age was 4.79, 5.38 and 6.15 feed/gain. The differences between means of male lambs feed conversion, due to age at start of fattening effect, was significant at first, second and third (P<0.01) months of fattening period.