Breeding Soundness Examinations of Rams: Semen Collection and Evaluation

Dear Colleagues,

Ram fertility is a crucial characteristic that affects the production and economic efficiency of sheep herds. Previous studies have revealed that 70–75% of rams in a flock are reproductively optimal; therefore, the management of rams is fundamental. Breeding soundness examination (BSE) refers to the overall assessment of a ram’s ability to service and impregnate ewes. BSE is based on a clinical and physical examination, as well as a semen quality evaluation. BSE should be performed at least two months before breeding, especially because this period is required for sperm production and maturation. A high percentage of rams are culled because of substandard semen quality, such as low concentration and motility, increased morphological abnormalities, and DNA damage, etc. Even though no single diagnostic test can accurately predict ram fertility, researchers have stated that a combination of physical and laboratory tests can predict fertility. Overall, the assessment of a ram’s reproductive capacity is a significant tool for the improvement of the reproductive performance of the herd and the prevention of contagious or hereditary diseases.

In this Special Issue, we invite researchers focusing on breeding soundness examinations of rams, with a special emphasis on semen collection and evaluation, to submit their work on the following topics:

• Factors affecting BSE and semen collection and evaluation;
• Use of artificial intelligence in BSE and semen collection and evaluation;
• Culling of rams after BSE and semen collection and evaluation;
• Artificial insemination following BSE and semen collection and evaluation;
• Semen storage following BSE and semen collection and evaluation;
• Use of contemporary or innovative techniques for BSE and semen collection and evaluation.

This Special Issue intends to collect recent articles focusing on up-to-date and comprehensive primary or secondary research on this subject that aim to contribute to sheep herd sustainability.

Dr. Aikaterini Ntemka
Dr. Noelia González Orti
Guest Editors

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