RELATIONSHIPS BETWEEN HEMOGLOBIN TYPES AND NATURAL RESISTENCE TO NEMATODE PARASITES IN CORRIEDALE SHEEP.
Abstract
The resistence to nematode parasites in Corriedale sheep was studied to different types of hemoglobin (Hb). A group of 239 gimmers (24 with HbA, 103 with HbAB and 112 with HbB) were exposed to the same type of management and natural infection. Samples of feces were colleted on average every 28 days of Dec/90 to Nov/91 and were used for nematode egg counts per gram (EPG). The study revealed that the sheep with HbA presented smaller percentage of positive animals for EPG (P<0.05) in the months of Dec/90, Jun/91, Oct/91 and Nov/91 in relation to the sheep with HbB. The sheep with HbAB presented smaller percentage of positive animals for EPG (P<0.05) in the months of May/91 and Jun/91 in relation to the sheep with HbB. The hemoglobin type B sheep showed the highest mean values of EPG (P<0.05) in the months of Dec/90, May/91, Jun/91, Oct/91, and Nov/91. The results obtained in this study suggest that the sheep with HbB are the most susceptible to nematode parasites evaluated by fecal egg counts.
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