Relationships of Faecal Worm Egg Count with Body Weight and Male Fertility In South African Merinos

Abstract Text:

Data from a Merino sheep selection experiment were used to derive relationships of faecal worm egg count (FEC) with body weight (birth and weaning) and scrotal traits. The genetic correlation of FEC with body weight and scrotal traits were favourable. Favourable genetic correlation with scrotal traits suggested that rams with low levels of gastro-intestinal nematodes are likely to have higher testis measurements, thereby possibly improving overall flock fertility. Further research on FEC is essential to aid communication to South African Merino farmers for the need to select against nematode infestation to reduce or control expenses.

Keywords:

Merino

Faecal worm egg counts

Body weight

Ram fertility