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반추위 삽입 센서를 활용한 육성기 홀스타인 거세우의 생리 상태 변화 평가
왕준호 ( Junho Wang ),유대겸 ( Daekyum Yoo ),서자겸 ( Jakyeom Seo ) 한국축산학회 2022 축산기술과 산업 Vol.9 No.1
In the last decade, the wireless biosensor technologies for cattle have been widely spread over the world. The objective of this study was to evaluate the changes of physiological state in Holstein growing steers using the rumen bolus sensor. A total of thirty-two Holstein young steers (219.48 ± 16.61 kg, 7.25 ± 0.40 months of age) were used and the rumen bolus was orally administered to each steer before conducting this experiment. The rumen bolus used in this study (Smart alyacⓇ, Hankook Iot Corp, Gimcheon, Korea) can measure not only body temperature (BT) but also moving behavior which was expressed as indices (moving index, MI). All steers equipped with the bolus sensor were housed in pens (4 animals per pen) and the sensor data were collected for 29 days. During experimental period, the average MI for the day (day: 0700-1900, night: 2000-0600) was significantly higher than that for the night (day: 111.10, night: 98.53, p < 0.0001), but the result of average BT was opposite (day: 39.04℃, night: 39.62℃, p < 0.0001). The average MI in animals having low average daily gain (ADG) was higher than those having high ADG (low ADG: 105.46, high ADG: 103.66, p < 0.0001) and average BT was the same (low ADG: 39.41℃, high ADG: 39.33℃, p < 0.0001). When the steers exposed to several stresses, the average MI was significantly lower than that in normal condition (normal: 117.40, stress: 109.88, p < 0.01). Stressed steers also showed increased BT compared to steers in normal condition (normal: 38.78℃, stress: 39.50℃, p < 0.0001). In conclusion, rumen bolus sensors, which generally used in cows to detect estrus, can be applied even to steers to detect the physiological changes rapidly in stressful environment.
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에너지 및 반추위 미분해단백질 수준을 달리한 사료급여가 비유중기 유우에 미치는 영향
박수범(Su Bum Park),임동현(Dong Hyun Lim),박성민(Seong Min Park),김태일(Tae Il Kim),최순호(Sun Ho Choi),권응기(Eung Gi Kwon),서자겸(Jakyeom Seo),서성원(Seongwon Seo),기광석(Kwang Seok Ki) 충남대학교 농업과학연구소 2013 농업과학연구 Vol.40 No.4
Sources of energy and rumen undegradable protein (RUP) have been used to meet nutrient requirements for high producing dairy cows. However studies for manipulation the levels of energy and RUP in diets have been mainly achieved using dairy cows at early-lactation period. The objective of this study thus, was to investigate the effects of different energy and rumen undegradable protein (RUP) levels on dry matter intake and milk yield in Holstein cows at mid-lactation period. Basal diet was prepared as TMR to meet nutrient requirements for dairy cows at mid-lactation according to NRC recommendation. Cows of control group (Con) were fed only basal diets while ground corn (0.5 ㎏/d), heat-treated soybean meal (0.5 ㎏/d), and their mixture (0.25 ㎏ of each supplements/d) were added to diets for cows of treatment groups (T1, T2, and T3 respectively) to modulate the level of energy and RUP contents in diets. Addition of energy or RUP source in basal TMR did not affect in total DMI while TMR intake tended to be higher in Con compared to T3. Cows fed T3 diets tended to show increased milk yield and MUN content than those of Con. Cows for T2 as well as T3 had lower ADG (P<0.05) compared with those of Con. We concluded that the addition of RUP source in diets for dairy cows on mid-lactation period might cause the decrement of DMI and ADG.
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