|Big boys waiting to be weighed|
For the final weigh period, the short-scrotum (SC) lambs had the highest ADG, 0.818 ± 0.159 lbs. per day. The ram lambs had a higher ADG than the wether lambs: 0.797 ± 0.213 vs. 0.729 ± 0.127 lbs. per day. For the 105-d duration of the study, ADG ranged from 0.550 to 0.937 lbs. per day and averaged 0.744 ± 0.086 lbs. per day. The median ADG was 0.737 lbs. per day.
Overall, the ram lambs had the highest ADG: 0.788 ± 0.100 lbs. per day. The short-scrotum lambs had a higher ADG than the wether lambs: 0.759 ± 0.064 lbs. per day vs. 0.697 ± 0.063 lbs. per day. The ADG of the ram lambs was 13 percent higher than the wether lambs. The short-scrotum lambs gained 8.6 percent more than the wether lambs. The differences were consistent across weigh periods.
|Sex||No.||Start wt.||End weight||105-d ADG||ADG ratio|
|Ram||21||45.0 ± 10.3||127.8 ± 16.5||0.797 ± 0.213||113.0%|
|Short scrotum||18||45.1 ± 10.9||124.7 ± 12.8||0.759 ± 0.064||108.6%|
|Wether||25||43.5 ± 10.9||116.8 ± 13.3||0.697 ± 0.063||100.0%|
|ALL||64||44.4 ± 10.6||122.6 ± 14.9||0.744 ± 0.086|
During the experiment, no lambs required deworming. FAMACHA© scores were mostly 1s and 2s. One ram lamb was removed from the study for health reasons.
The lambs were grazed throughout the study. Pastures consisted of mixtures of mostly cool season grasses, legumes, and forbs. There was also a one acre planting of warm season grasses and legumes. Lambs were hand-fed grain twice daily, at 2-3% of body weight. The grain was a balanced mix of whole barley, soybean meal, and minerals.There was also hay in the laneway.