한우비육시 사료급여수준이 에너지이용효율에 미치는 영향

탁태영,이상철,강태홍,김강식 ( T . Y . Thak,S . C . Lee,T . H . Kang,K . S . Kim ) 한국축산학회 1986 한국축산학회지 Vol.28 No.6

In order to investigate the influence of feeding level on the efficiency of energy utilization in fattening of Korean native cattle, a metabolic experiment was carried out with four mature Korean native cows by Latin square method. After determining 1.5㎏ mixed hay and 2.6㎏ concentrate mixture as the amounts for maintenance, 1.5, 2.0, 2.5 and 3.0 times of the amounts of maintenance were calculated and fed to each of cattle successively by the feeding schedules. The regression equations between the energy intake and the proportion of energy deposited were made. The results above suggested 249.7 Kcal ME and 136.1Kcal net ME per metabolic body size daily should be fed to maximize the proportion of ME deposition and net ME deposition. At this point daily DM intake was about 2.2% of body weight.

한우의 기초대사에 필요한 에너지 및 질소에 관한 연구

탁태영,강태홍,장윤환 ( T . Y . Thak,T . H . Kang,Y . H . Chiang ) 한국축산학회 1981 한국축산학회지 Vol.23 No.1

This study was conducted to measure the heat production of fasting animals known as basal metabolism on the process of investigating the maintenance energy and nitrogen of Korean native cattle to establish a feeding standard. The five cows were employed and the Brouwer`s equation was utilized to measure the heat production from oxygen consumption, carbon dioxide and methane production and urinary nitrogen. The results obtained were as follows : 1. The digestibility and retention rate of nitrogen were determined as 44% respectively, through the digestion trial carried out prior the fasting experiment for 7 days. 2. The amount of nitrogen excreted during the 5th and 6th days of fasting experiment was known as 224.69 ㎎ per metabolic body size (three quarter power of kg body weight) per day. 3. The hours spent standing and frying were investigated as 770.72 min. (53.52%) and 669.28 min. (46.48%), respectively, during the respiration trial. The times changing position was 8.6 a day. 4. The heat production on the basis of lying position was 53.94 ㎉ per metabolic body size per day for Korean native cows tested. This figure was found as similar to that of Japanese cattle but considerably lower than those of the other species of beef and dairy cattle investigated in foreign countries.

대사시험에 의한 한우성빈우 ( 韓牛成牝牛 ) 유지시 양분요구량에 관한 연구

탁태영,강태홍,김강식 ( T . Y . Thak,T . H . Kang,K . S . Kim ) 한국축산학회 1983 한국축산학회지 Vol.25 No.2

To estimate the energy and protein requirements for maintenance of Korean Native Cattle, balance experiments of nitrogen and energy have been conducted and the results are compared with those of other breeds in foreign countries and discussed. Series of trials were conducted feeding on maintenance amounts of the Korean Native Cow fed rice straw and hay as a major feeds. These cows were all dry and non-pregnant Korean Native Cow aged from 3 to 9 years. 1. While the average daily nitrogen excreted per metabolic body size (.㎏0.75) per day on 5th and 6th days of fasting was 360.845㎎ (average of 28 trials), and the average fasting heat production of 28 cases on the lying basis per ㎏0.75 per day was 54.32 ㎉. 2. The maintenance requirements of protein per metabolic body size would be sufficient at the amount of 2.26g DCP and 4.85g CP. 3. The ranges of energy loss expressed as the percentage for the gross intake in feces, urine, methane and heat production was 50.68, 1.64, 6.01 and 36.40%, respectively. 4. Net energy (BMR), metabolizable energy, digestible energy and TDN were 54.3, 85.59, 101.34㎉ and 26.53g per ㎏ 0.75 and were 4.40, 6.93, 8.20㎉ and 2.15 ㎏ per 350㎏ of body weight, respectively. 5. From the results of balance and feeding experiments, the average dry matter intake was 62.30g per ㎏ 0.75, corresponding to 1.4% for body weight.

한우에 의한 사료가치평가방법에 관한 연구 1 . 소화율측정시 오차의 크기에 관한 연구

탁태영 ( T . Y . Thak ) 한국축산학회 1983 한국축산학회지 Vol.25 No.3

In this paper, some of properties and magnitude of the error variance of digestibility with Korean native cattle were estimated and discussed. , 1 The error variance of digestibility was divided into two important portions - error due to individual cattle (σ²n) and error due to chemical analysis of feces (σ²a) by the hierarchial classifications. The magnitude of σ²n was 31times as large as σ²a. It suggested that in order to measure the digestibility with high accuracy, it is more effective to increase the number of cattle used. Considering the cost of experiment, however, it may be economical to measure the chemical components in feces-with high accuracy. Confident interval at 95% level of digestibility and digestible nutrients measured using N cattle per ration were computed from the error variances. The error of digestibility of ration ingredient itself, not of the whole ration, shows a value $quot;k$quot; times that of the whole ration.

노폐한우의 비육기간이 비육효과에 미치는 영향

강태홍,탁태영 ( T . H . Kang,T . Y . Thak ) 한국축산학회 1981 한국축산학회지 Vol.23 No.1

Twenty non-pregnant and over 8 years old Korean native cow were used in studying the effects of fattening performance with different fattening duration. Offered fattening duration were 40,60,90 and 120 day. The results obtained are summarized as follows; 1. A significant difference (P$lt;.05) was observed among the fattening lengths. The 40day duration resulted in the most effective fattening performance as 1.193 ㎏ daily body weight gain among treatments. 2. There appeared a significant difference (P$lt;.01) in feed efficiency among treatments except between 90 and 120 days of fattening duration. 3. Non significant difference (P$gt;.05) was observed in dressing percentage among fattening durations. The dressing percentage of 40, 60, 90 and 120 days period were 57.6, 59.4, 58.9 and 57.9, respectively. 4. Net income per head per day was higher in 40, and 60 days of short period fattening-compared with 90 and 120 days. In the total net income, however, resulted in higher at the 6o and 90 days. 5. Consequently, the 40 to 60 days short fattening period might be recommended in fattening duration for the old Korean Native cow.

NaOh 처리 볏짚 급여시 축우의 성장능력 및 생리적 상태에 미치는 효과

강태홍,이상철,탁태영,김강식,황의경 ( T . H . Kang,S . C . Lee,T . Y . Thak,K . S . Kim,I . K . Hwang ) 한국축산학회 1985 한국축산학회지 Vol.27 No.7

This experiment was conducted to confirm the effect of sodium hydroxide spray treatment and to know whether the physiological changes occur, when spray treated rice straw was fed to cattle during long-term period. Fifteen male Holstein cattle weighing about 200 ㎏ were randomly assigned to three treatments (untreated, 5% NaOH and 10% NaOH treated), Daily weight gain was slightly but not significantly increased by the 5% sodium hydrorcide treatment, bur decreased by the 10% sodium hydroxide treatment. Feed utilizations were improved by the sodium hydroxide treatments and it would be explained by the reduced daily DM intake. Serum Na and K levels were not increased by either 5% or 10% sodium hydroxide treatments of rice straw, There were no consistent or significant changes in the serum concentrations of other minerals betwesn untreated and sodium hydroxide-treated rice straw fed groups. Although plasma bicarbonate concentrations were elevated by the sodium hydroxide treatment, metabolic alkalosis was unlikely to be generated. Total VFA concentrations in the rumens were slightly increased but not significantly different by the sodium hydroxide treatments.

비육시 (肥育時) 한우와 젖소의 단백질과 에너지 요구량 및 그 이용효율

강우성(W . S . Kang),탁태영(T . Y . Thak),강태홍(T . H . Kang) 한국축산학회 1989 한국축산학회지 Vol.31 No.7

This experiment was carried out to determine the efficiency of protein and energy utilizations of fattening Korean Native and Holstein breeds and to compare the efficiency of protein and energy utilizations between two breeds. Eight steers were used for metabolism trials and the experimental periods were divided into 5 stages according to body weights from 250 to 550㎏. The results obtained were as follow: 1. Although energy utilization and daily body weight gain were not different between breeds, the rate of daily body weight gain of Korean Native Cattle(KNC) decreased after 400kg of body weight while Holstein cattle(Hol) decreased after 450㎏ of body weight. 2. The nitrogen retention rate was decreased with fattening stage, and the degrees of change were larger in KNC than HOL. 3. Although the amount of nitrogen consumend was not markedly different, the nitrogen retention rate was higher in KNC than in HOL. 4. HOL seemed to have converted feed to body weight gain more efficiently than KNC by 10%.

홀스타인 젖소의 유지에 대한 에너지 및 단백질 요구량

강우성(W . S . Kang),탁태영(T . Y . Thak),강태홍(T . H . Kang),정천용(C . Y . Chung) 한국축산학회 1989 한국축산학회지 Vol.31 No.10

To estimate the energy and protein requirements for maintenance of dry Holstein cows, 3 series of experiments on nitrogen and energy balance were conducted. The results obtained were as follow. 1. Nitrogen excreted into urine on 4-5th day of fasting was 405.7㎎/W^0.75, and DCP requirement was 2.5g /W^0.75/day. 2. Net energy, metabolizable energy, digestible energy and TDN requirements for maintenance were 88.3, 116.4, 150.4Kcal and 38.4g per metabolice body size, respectively.