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Pregnancy Diagnosis and Early Embryonic Development Using B-mode Ultrasound on Dairy Cow

Author: JiaGuoHui
Tutor: WangXingLong
School: Yangzhou University
Course: Animal Genetic Breeding and Reproduction
Keywords: Dairy cow B- Pregnancy diagnosis Embryonic development
CLC: S858.23
Type: Master's thesis
Year: 2009
Downloads: 155
Quote: 3
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Abstract


The in-depth study of early pregnancy diagnosis in cows B method, application of B- observed the the cows early embryo and uterine developmental changes , derived variation data curve . Test is divided into two parts : Part 1 : application of the B ultrasound technology for the cows early pregnancy diagnosis in breeding 126 cows from 20 to 60 days B- pregnancy test , results showed that 20 to 22 days , 23 to 25 days two time periods diagnostic accuracy rate is relatively low , 47.62% , 76.19% ; higher diagnostic accuracy rate of 26 to 28 days , is 90.48% , diagnostic accuracy rate of pregnancy 100% diagnosis empty Wye accurate rate of 90.91% ; 29 to 31 days , 32 to 60 - day diagnostic accuracy rate of 100% , so the draw the medium performance B ultrasound diagnosis of early pregnancy period is 29-31 days ; better than young cattle B- effect of early pregnancy diagnosis in 20 to 28 days after cows ; same time , test criterion B ultrasound pregnancy diagnosis , Note B causes of misdiagnosis were discussed . Part 2 : application of B-ultrasound technology observe cows early embryo and uterus variation of the B- 30 breeding cows early embryo and uterus for data measurement , analysis of the results of estrus the reproductive organs width reached maximum the diestrus reduce to minimum; pregnancy cow embryo growth of 20 to 29 days the most slowly, accelerate the growth of 30 to 50 days 51 to 70 days is the fastest period of early fetal development , forming most of the physical organs , especially skeletal development is the fastest ; 55-60 days is the best period of early fetal B- gender identification . 20 to 70 days , pregnant cows cervical width did not change significantly , the average width of 21.57mm the pregnancy side uterine horn increased rapidly over the time of pregnancy , changes in the range of 26.81 ± 1.33mm to 92.50 ± 2.39mm .

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CLC: > Agricultural Sciences > Livestock, animal medicine,hunting,silkworm,bee > Animal Medicine ( Veterinary Medicine) > Livestock, poultry, wildlife diseases > Livestock > Cow
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