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Volume 2003 (2003)
- Issue 40 Pages 1-
Volume 2003, Issue 40
Displaying 1-3 of 3 articles from this issue
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Tomoya USAGAWA, Azusa KOMURA, Makoto NAKAMURA2003 Volume 2003 Issue 40 Pages 1-6
Published: December 20, 2003
Released on J-STAGE: April 22, 2011
JOURNAL FREE ACCESSChanges in tensile strength of stretching fleece buried in the ground were investigated. Fleece stored for three-years, two-years and two-months were used for this investigation. Fleece were buried in furrows of 30 cm in height each, with separation at the upper and lower parts. Fleece were buried in the last part of June, and were dug out every 2 weeks for measurement, observing the condition of the fleece in the ground. The tensile strength was measured by stretching air-dried fleece samples (0.03 g each) using a digital force gauge.
The mean strength before burying was 24.8 N for three-year stored fleece, 28.2 N for two-year stored fleece and 34.1 N for two-month stored fleece, respectively. The mean strength of three fleece samples dug out from the ground were 17.8 N for the upper part and 16.3 N for the lower part at 2 weeks after treatment, and were 4.0 N for the upper part and 0.4 N for the lower part at 6 weeks after treatment. A remarkable decline in strength was observed in fleece dug out from the lower part 4-8 weeks after treatment. From 8 weeks after treatment, digging out the fleece in the original form became difficult, and fleece dug out showed a significantly weakened condition.
These results show that fleece buried in the ground will be very weakened after more than 2 months of treatment, and that rotary plowing on fields can be performed after 3 months of treatment.View full abstractDownload PDF (1607K) -
Kenji TSUNODA, Heramba B. RAJBHANDARY, Keizo SATO2003 Volume 2003 Issue 40 Pages 7-11
Published: December 20, 2003
Released on J-STAGE: April 22, 2011
JOURNAL FREE ACCESSIn oder to ascertain the extent and distribution of two major mitochondrial DNA (mtDNA) haplotypes, A and B, in four European sheep breeds and four local Asian sheep breeds, the Hinf I restriction fragment length polymorphism of mtDNA genomes was assayed using PCR techniques. In the European sheep group, Suffolk and Cheviot sheep had a conspicuously high frequency of type B (88 and 100%, respectively). However, in both of Corriedale and Finnish Landrace sheep, type A was seen at comparatively high frequency of about 40%, accompanied by a high frequency of type B. On the other hand, in the Asian sheep group, the frequency of type A was considerably high in Kagi and Lampuchhre sheep belonging to the Indian sheep group (95% and 96%, respectively). As for the Tibetan sheep group, Baruwal sheep had type A haplotypes at the frequency of 90%. However, 60% of Bhyanglung sheep were type A and 40% were type B, the frequency being different from those of the other local Asian breeds tested. The frequency constitution of the haplotypes varied among breeds. It was difficult to estimate their genetic relationships. However, from the level of global sheep groups such as European and Asian sheep, the average frequency of type B in the former was 71%, while the average frequency of type A in the latter was 85%. A marked difference between both sheep groups was seen. This finding, therefore, suggest that European and Asian sheep respectively consist chiefly of animals derived from different ancestoral maternal lineages.View full abstractDownload PDF (768K) -
Tomoya USAGAWA, Masaharu OKADO2003 Volume 2003 Issue 40 Pages 12-19
Published: December 20, 2003
Released on J-STAGE: April 22, 2011
JOURNAL FREE ACCESSThe behaviour of Suffolk lambs placed in an outside fenced area was investigated for the purpose of obtaining useful basic data for proper sheep management. Continuous twenty-four hour observations were performed by a video-recording system at the outside fenced area (5m × 5m) from one month till three months of age. Lambs showed 11.2-13.9 hours per day of resting behaviour in a squatting or lying posture. The mean frequency of feeding behaviour per hour was 3.0 times for daytime and 1.6 times for nighttime at 1 week after 1 month of age, showing the necessity of exclusive feeding of lambs. Drinking behaviour was observed in the intervals between feedings. The mean frequency of drinking behaviour per hour was 0.9-1.4 times for daytime and 0.1-0.4 times for nighttime, showing the necessity of a water supply for lambs even in their nursing period. The mean frequency of sucking behaviour per day was 82.5 times at 1 week after 1 month of age, which then decreased gradually, to 20.5 times at 8 weeks after 1 month of age. The mean sucking bout duration was 9.8-11.0 seconds. From the data of sucking behaviour compared with the author's data in the inside pen, the ewe-lamb relationship seemed to become closer when they were placed in the outside pen during the nursing period.View full abstractDownload PDF (926K)
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