Lamb mortality is major constraint of sheep fanning in Nepal and causes economical losses to thesheep industry. This mortality is high in the migratory flocks and various factors are responsible. A lot of lambs are lost due to faulty management, go missing in the forest or are taken by predators. These losses are an added burden to the sheep farmer. A comparative study was made between Polworth Cross and Baruwal lambs in Ghundruk area,Kaski District. The result showed that 23.5% died, and 10.9% were lost from the cross breed population, while17.7% died due to various diseases, and 18.2% were lost in the Baruwal breed. Some reasons for these differencesare suggested and discussed.

Lamb mortality is major constraint of sheep fanning in Nepal and causes economical losses to thesheep industry. This mortality is high in the migratory flocks and various factors are responsible. A lot of lambs are lost due to faulty management, go missing in the forest or are taken by predators. These losses are an added burden to the sheep farmer. A comparative study was made between Polworth Cross and Baruwal lambs in Ghundruk area,Kaski District. The result showed that 23.5% died, and 10.9% were lost from the cross breed population, while17.7% died due to various diseases, and 18.2% were lost in the Baruwal breed. Some reasons for these differencesare suggested and discussed.