• Asian-Australasian Journal of Animal Sciences
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• 제2권3호
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• pp.145-146
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• 1989

• 대한수의학회지
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• 제27권2호
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• pp.335-337
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• 1987

This study was made to determine possibility of the electromyographic diagnosis of the experimentally induced adhesion of rumen to abdominal wall in goats. In goats with experimentally induced ruminal adhesion, the electromyograms were recorded at the abdominal wall accompanying with the ruminal motility. There were, however, no electromyographic recordings during ruminal motility in goats without ruminal adhesions. It was concluded that the electromygrams could be available for the diagnosis of the ruminal adhesion to abdomieal wall in ruminants.

• Asian-Australasian Journal of Animal Sciences
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• 제15권6호
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• pp.859-865
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• 2002

The aim of this research was to clarify the direct effects of a hot environment on ruminal motility in sheep fed twice a day. In the first experiment, in order to equalize variable factors excluding the ambient temperature between the thermoneutral environment ($23^{\circ}C$, relative humidity 80%) and the hot environment ($32^{\circ}C$, relative humidity 80%), sheep were fed equal amounts of the same quality feed twice a day. The sheep were allowed free access to water for the duration of the two one-hour feeding periods (10:00 am-11:00 am, 5:00 pm-6:00 pm). On the fourth day after exposure to the hot environment, the frequency and strength of ruminal contractions were continuously recorded between 9:30 am and 11:00 pm. Prior to the exposure to a hot environment the frequency and strength of ruminal contractions were recorded in a thermoneutral environment during the period 9:30 am-11:00 pm. In the second experiment, in order to maintain the stomach content of the sheep at equal levels in both environments, the sheep were fed equal amounts of the same quality feed twice a day. Following the completion of the two one-hour feeding periods, a fixed amount of warm water was infused into the rumen. Rumen motility was then recorded during the same period as for the first experiment (9:30 am-11:00 pm). In the first experiment, when the frequency of ruminal contractions prior to (24, 24 frequency/15 min), during (48, 47 frequency/min) and after (22, 19 frequency/min) both the morning and afternoon feeding in a hot environment was compared with the values from the thermoneutral environment (20, 22; 50, 50; 21, 20 frequency/min), there was found to be no difference. However, the strength of ruminal contractions after morning and afternoon feeding (3.7, 3.1 mm Hg) in the hot environment decreased significantly in comparison with the thermoneutral environment (4.3, 3.8 mm Hg). In the second experiment, the frequency of ruminal contractions in the hot environment was not significantly different from that in the thermoneutral environment. The strength of ruminal contractions after ruminal infusion of warm water in the hot environment (morning: 4.6, afternoon: 4.5 mm Hg) was significantly lower than that in the thermoneutral environment (morning: 5.6, afternoon: 5.0 mm Hg). The results suggest that a hot environment acts directly on the strength of ruminal contractions in sheep fed twice a day rather than on the frequency.

• 대한수의학회지
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• 제27권1호
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• pp.127-135
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• 1987

Ruminal and abomasal motility after electroacupuncture was investigated in normal goats and in goats with induced hypocalcaemia. Electroacupuncture was performed with a current of 1 volt and 3Hz at the acupoints of Tien Ping(positive) and Pai Hui(negative) for 30 minutes. The adequate range of electroacupuncture stimulation for goats was 1 to 2 volt and 2 to 3 Hz. After electroacupuncture stimulation in normal goats, rates of rumen and abomasal contractions were not changed or were slightly increased, but amplitudes of rumen and abomasal motility markedly increased. The effects of electroacupuncture stimulation lasted from about 10 minutes to 30 minutes after the end of electroacupuncture. The amplitudes of rumen motility were increased by the administration of bethanechol chlorids in goats. Ruminal contractions were not influenced by electroacupuncture following atropine sulphate. The rates of rumen and abomasal movements were not changed, but its amplitudes were reduced by inducing hypocalcaemia in goats. Motilily of the rumen and abomasum was not accelerated by electroacupuncture in goats with induced hypocalcaemia.

• 대한수의학회지
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• 제34권3호
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• pp.471-478
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• 1994

Effects of histamine on the ruminal smooth muscle motility of cattle were investigated in the longitudinal and circular smooth muscle strips. In order to these experiments, specimens were obtained from 35 korean native cattles, 3-4 years old, in Kwang-ju area slaughterhouse. Smooth muscle strips of rumen were made from sample, and then measured the isometric contraction with physiograph in $37{^{\circ}C}$ organ bath. The results were as follows : 1. Histamine caused two different types of response(a contraction or a relaxation) on the smooth muscle of cattle rumen. These responses increased in dose dependant manner. 2. Pyrilamine($H_1$-receptor antagonist) completely blocked contraction in all the preparation and converted the response into relaxation. 3. Cimetidine($H_2$-receptor antagonist) completely blocked relaxation in all the preparation and converted the response into contraction. 4. The contraction induced by histamine($10^{-3}M$) was not Mocked by cholinergic, adrenergic blocker or hexamethonium. 5. The contraction induced by histamine($10^{-3}M$) was markedly inhibited in the $Ca^{2+}$ free(or EDTA 2Na) Kreb's solution and by verapamil.