Effects of Body Condition Score on Ovarian Activity of Bos indicus (ZEBU) Cows
The ovaries of 127 Bos indicus cows were used to evaluate the influence
of Body Condition Score (BCS) on ovarian activity. Each cow was given a body condition
score using a scale of 1 to 5 before slaughter. The presence or absence of pregnancy
was noted after slaughter and the ovaries were collected. Follicles were measured
and identified as small (1 to 4 mm), medium (5 to 8 mm) or large (≥9 mm). Corpus
luteum was classified as functional CL or Corpus albicans based on
gross morphology. Luteal structures and follicles were compared with different
phases of the oestrus cycle. Based on this, the cows were classified as cycling,
pregnant, anestrus, prepubertal heifers or having abnormal ovarian cyclicity.
Cows with BCS 3 exhibited more medium follicles (p<0.001) than cows with BCS 1
and BCS 2. Cows with BCS 3 had more large follicles (p<0.01) than cows with BCS
1. The incidences of cycling and pregnant animals correlated positively with BCS.
Incidences of anestrus and abnormal ovarian cyclicity correlated negatively with
BCS. It was concluded that change in BCS had significant effect on ovarian function
of Zebus cows.
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