• 대한수의학회지
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• 제62권2호
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• pp.15.1-15.8
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• 2022

The objective of this study was to identify risk factors for repeat breeder dairy cows and their impact on reproductive performance. The characteristics of 1,504 cows, including their peripartum health, nutrition, production, and reproduction, were collected. Cows with metabolic disorder were significantly more likely (odds ratio [OR], 2.47; p < 0.001) and cows with clinical endometritis tended to be more likely (OR, 1.35; p < 0.1) to become repeat breeders than cows without metabolic disorder and clinical endometritis, respectively. Cows initially inseminated > 80 days after calving were less likely (OR, 0.78; p < 0.05) to become repeat breeders than cows initially inseminated ≤ 80 days after calving. As a result, repeat breeding in dairy cows resulted in a 90 day longer (p < 0.0001) mean interval from calving to pregnancy. In conclusion, postpartum metabolic disorder, clinical endometritis, and a short interval from calving to initial insemination were risk factors for repeat breeder dairy cows, resulting in a severely impaired reproductive performance.

• 대한수의학회지
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• 제34권1호
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• pp.189-193
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• 1994

This study was undertaken to clarify the relationship between the cause of repeat-breeder and the luteal dysfunction in repeat-breeder dairy cows that failed to conceive to three or more artificial insemination(AI) at a regular interval. Progesterone concentrations were measured in milk fat for 20 to 22 days after AI. From the 15 repeat-breeder dairy cows, six cows had a normal progesterone profiles. Five cows showed a delayed rise of the progesterone concentrations until 7 to 10 days after AI, two cows had a comparatively low concentration of milk progesterone below 150 ng/ml through most of the luteal phase, and two cows had a combined pattern of a delayed rise and a low concentration of milk progesterone during luteal phase. It is suggest that luteal dysfunction as indicated by progesterone profiles is one of the causes of repeat-breeder in dairy cows.

• 한국수정란이식학회지
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• 제12권1호
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• pp.117-122
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• 1997

The objective of this study was to enhance the pregnancy rate of repeat-breeder Hanwoo with gonadotropin-releasing hormone(Gn-RH) at the time, dose and site of administration.The results obtained were summaried as fallows:1.Ovulation time and pregnancy rate following GnRH administration time was 46.0, 27.4, 42.0 and 43.2hr and 33.3, 57.1, 37.5 and 40.0% at non-treatment, estus, 1st A' and 2nd Al treatment, respectively.2. Ovulation in repeat-breeder was induced 100% within 24hr with GnRH administration at the time of estrus.3. Ovulation time and pregnancy rate following GnRH adminstration dose and site was 25.2, 32.6, 17.6 and 27.6hr, and 28.6, 42.9, 75.0 and 66.7% at 50$\mu$g+IU, 50$\mu$g+IM, 100$\mu$g+IU and 100$\mu$g+IM treatments, respectively. It is concluded that GnRH administration for repeat-breeder was enhanced the pregnancy rate when treated with 100$\mu$g intrauterine at the time of estrus.

• 대한수의학회지
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• 제14권2호
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• pp.253-268
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• 1974

A total of 331 dairy cattle in Jeonnam area were examined for the breeding status and hematological values during the period from June to August. 1971 and 1974. The data obtained were analysed according to the status of breeding and the type of farm management. The results obtained in this work were summarized as follows: 1. 331 dairy cows were grouped as pregnant (63.81%) anestrus after parturition (12.45%), pregnancy unknown (11.48%), repeat breeder (10.32%), and others (1.94%). 2. The summery of reproductive histories and clinical examination were as follows. Average of calving interval was 16.5 months, interval from parturition to first breeding 97 days and postpartum interval to first estrus 72 days. Services per conception was 1.6 rate of postpartum estrus (60 days) 12.0%, and the rate of repent breeder 10.3%. 3. Generally, the blood values of RBC, Hb, serum total protein and A/G ratio were lower than those normal values, especially, the cows which showed abnormal values belonged to the repeat breeder and the unknown to conception group. The mean value for serum inorganic phosphorus was the normal value or hyperphosphatemia, on the other hand, the mean value for serum calcium of the repeat breeder group was the lowest than the other group. 4. Follow-up evaluations on the results of the laboratory tests strongly suggest that the problems of repeat breeder had a tendency to occur more frequently in the large herd (A and B type farm), and the Ca/P ratio of almost all the cows showed abnormal values.

• 종축개량
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• 제5권6호
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• pp.6-7
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• 1983

• 한국동물위생학회지
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• 제44권4호
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• pp.239-246
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• 2021

The fertility of dairy cows has been declining worldwide. The number of services per conception has increased, and repeat breeder (RB) cows are considered important in the dairy industry. However, there has been little research on RB cows in Korea. The objective of this study was to investigate the relationship between serum biochemical profiles and RB Holstein cattle in Korea and compare the results with those of studies conducted abroad. In addition, we investigated hidden factors that are needed for RB cattle to become pregnant. Overall, 34 Korean Holstein Friesian cows were divided into three groups: pregnant with normal cycling (PNC), pregnant with repeat breeder (PRB), and non-pregnant with repeat breeder (NRB). Blood samples were collected from the jugular vein, and serum parameters (ALT, AST, ALP, GGT, LD, CK, TP, ALB, GLOB, TBIL, BUN, CRE, GLU, TC, TG, NEFA, CA, MG, and IP) were analyzed. GGT levels were significantly different among groups (P=0.01). The concentration of GGT was the highest in the NRB and the lowest in the PNC. In contrast to the findings of other studies, there were no differences in GLU, TP, TC, and BUN levels. This study is the first to investigate serum biochemistry in RB cattle and provides results that differ from those of previous studies; these findings would help establish a novel approach to improve fertility of RB cattle.

• 한국가축번식학회지
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• 제23권2호
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• pp.175-180
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• 1999

본 실험은 한우 번식장애우와 저수태우의 혈액 성분 및 성선호르몬(estrogen과 progesterone)의 농도를 비교 분석하여 번식우의 기초적인 생리지표를 확립시키는데 있다. 본 실험의 결과를 요약하면 다음과 같다. 1. 저수태 한우와 번식장애우 혈중 albumin, BUN, Ca, cholesterol, creatine, glucose, phosphorous, total protein 및 triglyceride 함량은 3.28$\pm$0.05 와 3.27$\pm$0.04 g/㎗, 11.07$\pm$0.61와 12.69$\pm$0.88 mg/㎗, 9.98$\pm$0.10와 9.56$\pm$0.11mg/㎗, 105.75$\pm$3.57와 126.78$\pm$5.66 mg/㎗, 1.62$\pm$0.05와 1.65$\pm$0.09 mg/㎗, 67.46$\pm$3.07와 76.97$\pm$3.76 mg/㎗, 6.13$\pm$0.36 와 6.11$\pm$0.26 mg/㎗, 5.82$\pm$0.08와 6.18$\pm$0.08 g/㎗ 및 12.82$\pm$1.46와 15.19$\pm$1.61 mg/㎗으로 나타났다. 2. 혈청의 중요한 성분중 하나인 요소태 질소, 칼슘 및 인의 함량이 번식 장애우와 저수태우의 경우 정상우보다 다소 높은 경향을 나타냈으며, 특히 콜레스테롤의 함량이 번식 장애우와 저수태우의 경우 정상우의 약 2배정도 현저히 높은 성적을 나타냈다. 3. 발정주기중 혈액내 progesterone 수준은 임신우와 비임신우에서 수정후 18일까지는 비슷한 수준(6.55$\pm$0.17, 5.46$\pm$0.18 ng/$m\ell$)을 보였으나 그 후 임신우에서는 점차 증가하였고 비임신우에서는 발정일 (0.18$\pm$0.03 ng/$m\ell$)에 급감하였다. 4. 번식 장애우와 저수태우의 혈중 estrogen과 progesterone 함량은 각각 57.42$\pm$5.03, 56.76$\pm$8.73 pg/$m\ell$과 6.26$\pm$0.83 ng/$m\ell$, 9.41$\pm$1.85 ng/$m\ell$으로서, 혈중 progesterone 농도가 정상우의 황체기 수준으로 유지되어 발정발현과 수태가 억제되는 것으로 나타났다.

• 한국가축번식학회지
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• 제9권1호
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• pp.66-71
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• 1985

After the induction of estrus by the PGFF2$\alpha$-GTH combination on the 118 repeat breeder cow during of 6-13 days of the estrus cycle, the effects of GTH, antibiotics, antibiotics-GTH combination were compared. The results of this study, the following conclusion were obtained: 1. The rate of estrus was reduced the administration of GTH before the administration of PGF2$\alpha$. 2. The rate of ovulation delayed was 24.6% in the group with the administration GTH, but 34.1% without the administration GTH. Duration of ovulation was shortened by GTH. 3. The impregnation induction by the administration of PGF2$\alpha$, PGF2$\alpha$-antibiotics, PGF2$\alpha$-GTH-antibiotics were 41.7%, 69.5%, 55.6% and 80.8% respectively injection in the uterus was more effective than the administration. Before or after the A.I., the above combination was most effective. 4. In antibiotics sensitivity test in vitro of the intravagina bacteria, 5.0%, 12.7% and 60.0% of bacteria were sensitive to Penicilline, Streptomycin and Gentamicin respectively.

• 대한수의사회지
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• 제29권7호
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• pp.429-430
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• 1993

• 한국수정란이식학회지
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• 제13권1호
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• pp.21-28
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• 1998

From September 1993 to August 1997, we treated ovarian disorders in 1,782 repeat breeder cows after diagnosis by ultrasound on 35 farms in Kyeong-ki do. The rates of ovarian appearance were 59.8% of CL group, 16.7% of ovarian atrophy or hypofunction, 15.4% of luteal cyst, 4.3% of follicular cyst and 3.7% of follicle group in diagnosis with rectal palpation and ultrasound. The results of treatment for ovarian disorders were 1,316 cows(73.8%) in estrus, 348 cows(19.5%) in non-detected and 118 cows(6.6%) in unidentified. The rates of PGF$_2$$\alpha$, GnRH and mineral vitamin complex treatment to estrus were 79.6, 69.2 and 50.3%. Two groups were treated with 5 ml PGF$_2$$\alpha$ intramuscular injection(I.M.) and 1.5 ml PGF$_2$$\alpha$ intraovarian injection(I.O.), and the results of 1.5ml PGF$_2$$\alpha$ I.0. were significantly higher than that of 5ml PGF$_2$$\alpha$ I.M. in inductiom estrus(p<0.05). The pregnant rates were 29.8% in total repeat breeder cows with ovarian disorders following diagnosis and treatment. In summary, rectal palpation and ultrasonography were proven to be useful tools of diagnosis and treatment in ovarian disorders, and it was also suggested that the response to treatment with PGF$_2$$\alpha$ I.0. was better than PGF$_2$$\alpha$ I.M.