Goetsch A L, Jones A L, Stokes S R, Beers K W, Piper E L
University of Arkansas, Fayetteville 72701.
J Anim Sci. 1988 Jan;66(1):228-36. doi: 10.2527/jas1988.661228x.
Two experiments were conducted to determine the effects of frequency of offering and type of supplemental forage on intake and digestion in calves consuming endophyte-infected fescue hay (I). In Exp. 1, five Holstein steers, averaging 128 kg body weight (BW), were used in a 5 X 5 Latin square experiment. All steers were given free access to I in the afternoon. Morning meals consisted of 1) ad libitum access to I daily (control), 2) .5% BW of Bermuda-grass hay (BG) daily, 3) 1.0% BW of BG every 2nd d, 4) 1.5% BW of BG every 3rd d and 5) 2.0% BW of BG every 4th d. Steers receiving BG consumed less (P less than .01) I and more (P less than .01) total dry matter (DM) than did steers given I alone. Within treatment, I intake was similar (P greater than .10) among days of the feeding cycle without BG. Organic matter (OM) digestion was lower (P less than .05) with than without BG. In Exp. 2, 12 beef calves (Angus and Hereford X Angus; 6 mo of age, 155 kg initial BW) were used in a completely randomized-design experiment. Calves were given ad libitum access to I daily (control) or to BG or wheat hay (WH) on d 1 and I the following 3 d. Hay (I, BG or WH) intake d 1 of the feeding cycle was higher for BG and WH than for the control treatment (16 and 45%, respectively) and higher for WH than BG (25%; P less than .05).(ABSTRACT TRUNCATED AT 250 WORDS)
进行了两项试验，以确定在犊牛采食内生真菌污染的羊茅干草（I）时，补饲频率和补饲草料类型对其采食量和消化率的影响。在试验1中，选用5头平均体重（BW）128千克的荷斯坦阉牛，进行5×5拉丁方试验。所有阉牛下午可自由采食I。早餐包括：1）每天随意采食I（对照）；2）每天采食体重0.5%的百慕大干草（BG）；3）每隔一天采食体重1.0%的BG；4）每隔两天采食体重1.5%的BG；5）每隔三天采食体重2.0%的BG。采食BG的阉牛比只采食I的阉牛采食I的量更少（P<0.01），采食的总干物质（DM）更多（P<0.01）。在处理组内，不喂BG时，采食周期内各天的I采食量相似（P>0.10）。有BG时的有机物（OM）消化率低于没有BG时（P<0.05）。在试验2中，选用12头肉牛犊（安格斯牛和赫里福德×安格斯牛；6月龄，初始体重155千克），进行完全随机设计试验。犊牛每天可随意采食I（对照），或在第1天采食BG或小麦干草（WH），后3天采食I。采食周期第1天的干草（I、BG或WH）采食量，BG和WH高于对照处理（分别高16%和45%），WH高于BG（高25%；P<0.05）。（摘要截选至250词）
