Research Article
Repeat Breeding and Its’ Associated Risk Factors in Crossbred Dairy Cattle in Northern Central Highlands of Ethiopia
Table 2
Repeat breeders with risk factors (age, parity, BCS, milk yield, breeding methods, and herd size) in crossbred dairy cattle.
| | Risk factors | Retrospective study | | Group | No. of cows/heifers examined | Prevalence of RB no. (%) | X2 (-value) | Odds ratio (95% CI) | -value |
| | Age (years) | <4 | 201 | 32 (15.9) | 136 (<0.01) | Reference | <0.01 | | 5-6 | 148 | 44 (29.7) | 2.7 (1.2–6.4) | | >7 | 161 | 120 (74.5) | 9.2 (2.9–28.4) |
| | Parity (number) | <2 | 134 | 21 (15.7) | 133.1 (<0.01) | Reference | <0.01 | | 3 to 4 | 221 | 58 (26.2) | 3.3 (1.4–7.6) | | >5 | 155 | 117 (59.7) | 4.8 (1.6–15.1) |
| | BCS | Poor | 159 | 115 (72.3) | 43.15 (<0.01) | 24.3 (10.2–57.9) | <0.01 | | Medium | 272 | 72 (26.4) | 2.9 (1.3–6.7) | | Good | 81 | 9 (11.1) | Reference |
| | Milk yield (litters) | <10 | 148 | 33 (22.3) | 37.84 (<0.01) | Reference | <0.01 | | 10 to 20 | 235 | 95 (40.4) | 4.4 (2.5–7.8) | | >20 | 126 | 74 (58.7) | 20.9 (9.9–44.1) |
| | Breeding methods | AI | 284 | 144 (50.7) | 37.6 (<0.01) | 6.4 (3.9–10.6) | <0.01 | | Natural | 146 | 45 (30.8) | 1.5 (0.9–2.5) | | | Both | 80 | 13 (16.2) | Reference |
| | Herd size (numbers) | <10 | 139 | 54 (38.8) | 23.7 (<0.01) | Reference | <0.01 | | 10–20 | 74 | 40 (54.1) | 6.8 (1.9–24.5) | | >20 | 27 | 24 (88.9) | 12.6 (3.6–43.8) |
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