반축가축영양;호맥건초의 생육단계와 절단이 산양의 질소 및 Energy Balance 에 미치는 영향

전병태,문상호,광전수헌 한국축산학회 1995 한국축산학회지 Vol.37 No.1

This experiment was carried out to study associative effects of the chopping of hay at two stages of maturity on the nitrogen balance, nutritive value and energy balance in goats fed rye hay. Twelve Japanese goats were fed rye hay ad libitum in a unchopped form or chopped to 2 cm of chopping lengths. They were grouped into tetrads as follows: B I and B II were fed with unchopped and chopped hay at the boot stage, H I and H II were led unchopped and chopped hay at the heading stage respectively. Nitrogen intake(NI) and digestible nitrogen (DN) were significantly higher(p$lt;0.05) in groups (B I and B II) fed hay at boot stage ttran in groups(H I and H II) fed hay at heading stage. However, the differences corresponding with the chopping of hay were not accepted at both growth stages. Nitrogen losses as feces(FN) and urine(UN) were similar to the results for NI and DN, RN was high in groups(B I and B II) fed hay at the boot stage, although there was no significant difference (p$gt;0.05), but that had little differences in relation to the chopping of hay at both growth stages. On the other hand, the ratio of FN to NI wars higher in H I and H II than in B I and B II, while there were no great differences(p$gt;0.05) between unchopped hay and chopped hay at both growth stages. The ratio of UN to NI was similar of both growth stages. GE in groups(H I and H II) fed hay at the heading stage were significantly higher(p$gt;0.05) than those in groups fed hay at the boot stage. However, DE and ME were greater in groups(B I and B II) fed hay at the boot stage, although there was no significant difference for ME. TDN and DCP were also significantly higher(p$gt;0.05) in B I and B II than in H I and H II. No differences were recognized corresponding to the chopping of hay at both stages for GE, DE, ME, TDN and DCP. EI was a little lower in H I and H II than in B I and B II but was not significant. Energy lasses in FE, UE, CH, and HP did not differ in relation to the chopping and growth stage of hay. RE was 148.9, 108.9, 23.2 and 51.9 MJ/㎏W^(0.75) for B I, B II, H I and H II respectively, and thus RE in groups(B I and B II) fed hay at boot stage were significantly larger(p$lt;0.05) than those in groups(H I and H II) fed hay at heading stage. But there were no effects of the chopping of hay at both growth stages. RE was closely related with dry matter and energy intake(p$lt;0.05), especially with digestible dry matter and digestible energy intake(p$lt;0.01).

호맥건초의 생육단계와 절단이 산양의 채식행동별 에너지 소비에 미치는 영향

전병태,문상호,광전수헌 한국축산학회 1997 한국축산학회지 Vol.39 No.4

To determine the effect of the physical form of ration on energy metabolism in ruminants, this experiment was conducted through evaluating gas exchange and energy cost associated with feeding behavior in goats fed rye hay through a respiration trial. Unchopped and chopped hay 2 cm in length at the boot and heading stage were offered ad libitum to twelve goats. The O₂ consumed, CO₂ and CH, produced, and heat production were slightly higher in groups fed unchopped hay than in groups fed chopped hay at either the boot or heading stage. Diurnal changes of O₂ consumed, CO₂ and CH, produced, and heat production exhibited the similar patterns in all groups, reaching a peak from 12 hr to 19 hr. On the other hand, O₂ consumed was not correlated with voluntary intake of dry matter (VDMI), digestible dry matter (VDDMI) and digestible energy (VDEI) but CO₂ and CH4 produced were closely correlated (P$lt;0.05 or 0.01) with VDMI, VDDMI and VDEI. Heat production was closely related (P$lt;0.05) only to VDEI. Energy cost of eating was higher in groups fed chopped hay than in groups fed unchopped hay at both stages, although there were no significant differences. However, that of rumination was greater in groups fed unchopped hay than in groups fed chopped hay. Energy cost per minute was the lowest during eating and was higher for standing than for lying in rumination in all groups. There was more spendable energy in rumination and resting than in eating and this was greater in groups fed hay at boot stage than in groups fed hay at heading stage. This can be interpreted to mean that the influence of the physical form of hay on energy metabolism is greater for low quality hay than for high quality hay.

호맥건초의 생육단계와 절단이 산양의 채식 및 반추행동에 미치는 영향

문상호 ( S H Moon ),전병태 ( B T Jeon ),광전수헌 ( H Hirota ) 한국축산학회 1995 한국축산학회지 Vol.37 No.2

To determine feeding behavior in relation to quality and physical form of feed, this experiment was cunducted by feeding trials to evaluate eating and rumination behavior in goats fed a rye hay in a unchopped or chopped form harvested at two stages of maturity. Rye hay dried at two different stages of growth for experimental rations was offered ad libitum in the unchopped or 2cm long chopped form to twelve goats. Although there were no significant differences (P$gt;0.05), eating time was longer in the chopped form than in the unchopped form at harvested both growth stages, but times for the different growth stages were hardly different. Rumination time was longer in the group fed unchopped hay harvested at the boot stage and in the group fed chopped hay harvested at the heading stage, however, the differences were not significant (P$gt;0.05). Resting time was in contrast to rumination time. Goats in all groups exhibited the similar behavioral patterns, showing longer periods of eating from 12:00 to 19:00 and the most vigorous rumination after 19:00. However, the periods of rumination in groups fed hay harvested at the heading stage were greater than in groups fed hay harvested at the boot stage. Unitary time of eating per 100g or 100KJ of ingested nutrients was longer in groups fed chopped hay than in groups fed unchopped hay harvested at both growth stages, but there were no significant differences (P$gt;0.05) except for crude protein (P$lt;0.05). Unitary time of rumination per 100g or 100KJ of ingested nutrient was all long in the group fed unchopped hay harvested at the boot stage (P$gt;0.05) but was little different at heading stage. Unitary rumination time was significantly longer (P$lt;0.05) in groups fed hay harvested at the heading stage than in groups fed hay harvested at the boot stage. Number of chews was more numerous in groups fed unchopped hay than in groups fed chopped hay harvested at both stages and that was also greater at the heading stage than at the booting stage, although there were no significant differences (P$gt;0.05). As time past, number of chews per bolus tended to decrease in groups fed hay harvested at the boot stage but tended to increase in groups fed hay harvested at the heading stage. The result of chewing time per bolus was similar to that of number of chews. Chewing speed obtained by dividing the number of chews by chewing time was faster in groups fed unchopped hay than in groups fed chopped hay during the whole period and was faster in groups fed hay harvested at the heading stage than in groups fed hay harvested at the boot stage. Chewing speed was also the fastest during the period of 11:00-17:00 and tended to decrease therefore in all groups. Consequently, it is considered that feeding behavior is largely influenced by quality, chopping and intake of roughage.

호맥건초의 (胡麥乾草) 생육단계와 절단장이 산양의 소화율 , 자유채식량 및 반추위액 (反芻胃液) 성상에 미치는 영향

문상호(S . H . Moon),전병태(B . T . Jeon),광전수헌(H . Hirota) 한국영양사료학회 1995 韓國營養飼料學會誌 Vol.19 No.1