Impact of postpartum time period associated body condition score on reproductive performance in dairy cows

被引:3
|
作者
Kim, Ill-Hwa [1 ]
Jeong, Jae-Kwan [1 ]
Kim, Ui-Hyung [2 ]
机构
[1] Chungbuk Natl Univ, Coll Vet Med, Cheongju 28644, Chungbuk, South Korea
[2] Rural Dev Adm, Hanwoo Res Inst, Natl Inst Anim Sci, Pyeongchang 25340, South Korea
关键词
BCS; Calving; First AI; BCS loss; Reproductive performance; Dairy cow; AFFECTING CONCEPTION RATE; ARTIFICIAL-INSEMINATION; PREGNANCY LOSS; MILK-YIELD; TRANSITION PERIOD; HEALTH DISORDERS; HOLSTEIN COWS; FERTILITY; SURVIVAL; AI;
D O I
10.1016/j.theriogenology.2023.06.034
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
This study was designed to identify the time period at which the body condition score (BCS) most critically affects the reproductive performance after calving in dairy cows. Data were collected from 4865 lactation records (1821 from primiparous and 3044 from multiparous cows) on 28 dairy farms, including the BCS (at calving, and month 1 and the first artificial insemination [AI] after calving), the presence of peri- or postpartum disorders, reproductive data, and the weather. The data on the extent of BCS loss from calving to the first AI was divided into two periods, namely, between calving and month 1 after calving (period 1), and between month 1 and the first AI after calving (period 2). Cows with BCS of 3.0, 3.25 and > 3.5 at the first AI after calving were more likely (P < 0.05-0.01) to be pregnant at 30 (odds ratio [OR]: 1.36, 1.64, and 1.90) and 45 (OR: 1.39, 1.75, and 1.99) days post-AI and more likely (P < 0.050.01) to be pregnant within 180 days after calving (hazard ratio [HR]: 1.18, 1.43, and 1.58) than cows with BCS of <2.75. In addition, cows who suffered a BCS loss of >0.5 units during period 1 tended to be less likely (HR: 0.79, P < 0.1) to be pregnant within 180 days after calving than cows without a BCS loss. Cows with BCS of 3.0, 3.25, and >3.5 at calving were less likely (P < 0.1-0.05) to lose their pregnancy (OR: 0.37, 0.33, and 0.16) than cows with BCS of <2.75. These results indicate that the linearly higher BCS (3.0, 3.25, and >3.5) at the first AI is positively associated with the probability of pregnancy per AI after the first AI and the likelihood of pregnancy within 180 days after calving, whereas a higher BCS loss of >0.5 units during period 1 was adversely associated with the likelihood of pregnancy within 180 days after calving.& COPY; 2023 Elsevier Inc. All rights reserved.
引用
收藏
页码:107 / 114
页数:8
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