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Biomedical subjects

T Sawasaki

Publications and source records attributed to T Sawasaki.

7 recordsLinked to original sources
PubMed1987

Nonsurgical collection of embryos in Shiba goats.

A method of nonsurgical embryo collection in the Shiba goat, a native Japanese miniature goat breeding nonseasonally, was developed. The apparatus used for flushing the uterus was made on the model of the two-way catheter for cows. Embryo collection was performed on days 5 to 7 in 37 females superovulated with PMSG and hCG and resulted in successful recovery of 69 embryos in 19 females (51.4%). The average number of embryos collected from each successful female was 3.6. The recovery rate of embryos calculated on the basis of the number of embryos recovered and corpora lutea observed by culdoscopy in 15 successful females was 89.5%. This nonsurgical method seem to be efficient enough for collecting morulae and blastocysts in Shiba goats.

Animals↗
PubMed1979

[Cross-sectional anatomy of miniature "Shiba" goat].

The anatomical relations of visceral organs and other tissues in the thoracic, abdominal and pelvic cavities of the male miniature "Shiba" goat are illustrated as thirteen semi-diagramatic representations of cross sections.

Animals↗
PubMed1978

[Gene constitution of miniature "shiba" goats (author's transl)].

Genetic surveys were carried out on the miniature "Shiba" goats which have been raised in Nagasaki Prefecture, Japan. Recently, in thhe prefecture the number of "Shiba" goats have been markedly decreased to totally about 190 which are kept now only in two towns. Morphological genetic traits were observed to have been coming homogenous in Nagasaki Prefecture, and homogeneity of the traits in the colonies kept the National Institute of Animal Industry and in Stock Farm of University of Tokyo, especially in the latter, was remarkably high. The "Shiba" goats have white coat color, horns and supernumerary teats, but not wattles. Electrophoretic examinations of genetic variations at 27 blood protein loci revealed that variability in the "Shiba" goat populations were lower than that of the Japanese Saanen breed, and that the amount of gene flow from the Saanen breed into the "Shiba" goats was estimated to be smaller than into the present-day Okinawa meat goats. The genetic variability of the colony in Stock Farm of University of Tokyo was observed to be conspicuously low. From the results of pedigree analysis such a decay of genetic variability was postulated to come about from unavoidable inbreeding resulted from smallness both in numbers of foundation animals and in effective population size of the colony.

Animals↗
PubMed1977

[Biological characteristics of miniature "Shiba" goats (author's transl)].

Practical informations of miniature "Shiba" goats, that have since long been bred for meat consumption in Kyushu District of Japan, were provided for using as laboratory animals. Nine years ago, some pairs of the goats, were introduced to Stock Farm of Tokyo University from a National Institute. Thereafter, they were successfully bred and increased in number and were distributed to many laboratories for researchers. The "Shiba" goat is white coloured, horned, and much smaller in size while sharing common characteristics with full size goats. The handling is much easier with less amount of food consumption. The body weight are 24 to 28 kg and 15 to 22 kg in males and females, respectively. They are obedient and have a strong resistance to diseases, including cerebral nematodiasis. The productive characteristics are as follows: 1) Continuous breeder, 2) Age at the first parturition: 13 months, 3) Gestation period: 5 months, 4) Litter size: 1.84, 5) Rate of raising: nearly all, 6) Delivery interval: 8 months, 7) No intersexality. Hematological data were also demonstrated.

Amprolium↗