English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The experiment was conducted on 395 ewes and their 585 half-brothers divided into groups according to sires (50 and 37 groups, respectively). The date o f the first oestrus in yearling ewes, date o f successful mating o f older ewes and the number o f lambs born were studied. Testicular diameter and scrotum circumference were measured in growing rams dur ing stimulatory and inhibi tory photoperiods. The results o f testicular measurements o f these young rams were compared wi th the corresponding periods o f sexual activity and reproductivity o f related ewes. I t was found that the sire's genotype affected the t iming o f sexual activity o f ewes dur ing the spring-summer breeding season. The date o f successful mating o f yearling ewes was highly correlated (P^: 0.01) w i th their body mass. The correlation between the testis diameter index o f rams at 28 days o f age and the period o f the first oestrus in yearling ewes was significant (P ^ 0.05; r = 0.35), while that between this index and the date o f successful mating during the first breeding season was highly significant (P^O.01 ; r = 0.37). Significant correlations were also found between the scrotum circumference index at 100 days o f age and the period when fertilization o f ewes occurred dur ing the first breeding season (r = 0.28) and between this index and the number o f lambs born in the first lambing ( r = 0.27). K E Y W O R D S : sheep, first oestrus, breeding activity, breeding performance, size o f testicles

The relationship between the reproductiveness of ewes and testicle size of related rams