• Asian-Australasian Journal of Animal Sciences
• /
• 제7권4호
• /
• pp.487-491
• /
• 1994

The experiment was carried out to study the digestibility of nutrients in the neutralized urea-treated rice straw when it was fed singly or in combination with concentrates. A total of 8 crossbred Holstein steers were randomly allocated in a $4{\times}4$ Latin square design consisted of 4 treatments, in which the neutralized straw/concentrates ratio on DM basis varied as 100/0, 90/10, 80/20 and 70/30. The results indicated that the digestibility of DM, ether extract and NFE, and TDN and DE of the diets tended to increase with an increase in the level of concentrates. Regression analysis showed that the values of intercepts should be used for estimating DM digestibility, TDN and DE of neutralized straw, when it was fed with concentrates. Digestibilities of crude fiber, NDF and ADF tended to be higher when it was fed singly than when fed with concentrates. Digestibilities of organic matter and CP were not so much changed with the increasing level of concentrates. Although the animals singly fed the neutralized straw showed positive body weight gain and N-balance, it should be necessary to supplement the concentrates to get more body weight gain and N-balance in the crossbred Holstein steers.

• 생명과학회지
• /
• 제27권7호
• /
• pp.760-766
• /
• 2017

본 연구는 Lysophospholipase I (LYPLA1) 유전자의 SNP 마커인 rs385360448 g.23655332G>C의 유전자형이 제주도 한우와 제주흑한우(한우${\times}$제주흑우, JCC) 집단의 도체형질에 미치는 영향을 시험하였다. 한우 거세우 집단에서 LYPLA1 rs385360448 G/-를 보유한 도체는 C/C 동형접합에 비해 유의적으로 높은 수준의 근내지방도(MARB)와 조직감지수(TI)를 나타내었다(p<0.05). 반면, LYPLA1 유전자형은 도체중, 등지방두께, 등심단면적, 육색, 지방색에서는 유의적인 차이를 보이지 않았다(p>0.05). JCC 거세우에서는 LYPLA1 G/- 도체에서 C/C 동형접합에 비해 등심단면적(EMA)의 수준이 유의적으로 더 높았다(p<0.05). 이번 연구의 결과들은 LYPLA1 유전자형이 소의 등심에서 인지질 대사를 통해 근내지방도와 조직감의 수준과 등심단면적의 수준을 변화시킬 수 있음을 보여주고 있다. 이러한 결과들은 LYPLA1 유전자형이 한우와 제주흑우-유래의 산업화축군에서 도체형질을 개선할 수 있는 유전자 마커로써의 기능을 수행할 수 있을 것으로 기대된다.

• Asian-Australasian Journal of Animal Sciences
• /
• 제19권2호
• /
• pp.181-188
• /
• 2006

The objective of this research was to determine the effects of synchronizing the rate of dietary energy and nitrogen release on: ruminal fermentation, microbial protein synthesis, blood urea nitrogen, and nutrient digestibility in beef cattle. Four, two-and-a-half year old Brahman-Thai native crossbred steers were selected for the project. Each steer was fitted with a rumen cannula and proximal duodenal cannula. The steers were then randomly assigned in a $4{\times}4$ Latin square design to receive four dietary treatments. Prior to formulation of the dietary treatments, feed ingredients were analyzed for chemical composition and a nylon bag technique was used to analyze the treatments various ingredients for degradability. The treatments were organized in four levels of a synchrony index (0.39, 0.50, 0.62 and 0.74). The results showed that dry matter digestibility trend to be increased (p<0.06), organic matter and acid detergent fiber digestibility increased linearly (p<0.05), while crude protein and neutral detergent fiber digestibility were not significantly different (p>0.05). Higher concentration and fluctuation of ruminal ammonia and blood urea were observed in the animal that received the lower synchrony index diets. As the levels of the synchrony index increased, the concentrations of ruminal ammonia nitrogen and blood urea nitrogen, at the 4 h post feeding, decreased linearly (p<0.05). Total volatile fatty acid and bacteria populations at the 4 h post feeding increased linearly (p<0.05). Microbial protein synthesis trend to be increase (p<0.08). The results of this research indicate that synchronizing the rate of degradation of dietary energy and nitrogen release improves ruminal fermentation, microbial protein synthesis and feed utilization.