원문정보
초록
영어
The purpose of this study was to assess for re-breeding concentrate period in postpartum in milking cows. The 48 cows aged 3.5~5.5 years and of 400~600 kg body weight were examined every 3rd day from 15 to 36 day postpartum. Blood samples for progesterone and estradiol 17 β hormone analyses were withdrawn from the coccygeal vein every third day until the end of the experiment. The ovarian follicular numbers were verified and measured using a multi frequency probe. The least squares means are presented for each day by GLM of SAS. The results showed that ovary lengths (right ovary; 1.64±0.62 cm, left ovary; 1.44±0.46 cm) were similar in right and left ovary activity level during estrous cycle of postpartum cows. We were judged completed uterus on day at 2.31±0.17 cm level of cervix diameter. And we were monitoring started at 6.44±2.03 cm from day 15 after postpartum. The results showed that mean plasma concentration of progesterone (3.28 ng/ml) in large follicle gradually increased days 30 in postpartum. And, monitoring of estradiol 17β (22.18 pg/ml) hormone during postpartum period would be useful to predict the ovarian and uterus activity for re-breeding in postpartum milking cows. From these results, we conclude that cervix diameter (mean: 2.31 cm) was very important for reproductive organ recovery standard level of postpartum milking cows, hormone secretion level (P4: 3.28 ng/ml, E2: 22.18 pg/ml) and body condition score (2.5~2.75) level about 30 days in postpartum period.
목차
INTRODUCTION
MATERIALS AND METHODS
Ultrasound Examinations
Experimental Protocol
Hormones Analysis
Data Analysis
RESULTS
Change of Ovaries and Cervix Diameter after Parturition
Follicles Development Number Versus Hormone SecretionLevel
Follicles Development Number by Day Change after Parturition
DISCUSSION
REFERENCES