Effect of salinomycin or monensin on performance and feeding behavior of cattle fed wheat- or barley-based diets

Abstract

. 2001. Effect of salinomycin or monensin on performance and feeding behavior of cattle fed wheat-or barley-based diets. Can. J. Anim. Sci. 81: 253-261. Feeding behavior and growth performance of cattle fed diets containing monensin or salinomycin were assessed in two trials. In trial 1, 36 Hereford × Angus steers (267.7 ± 4.3 kg) were individually fed (n = 12) wheat-based transition and finishing diets containing no ionophore (control, C), 26 mg monensin (M) or 13 mg salinomycin (S) per kg of dietary dry matter (DM). Cattle fed M consumed less than those fed C or S, and their intake was more stable during the transition to the finishing diet. Overall, steers fed M exhibited lower dry matter intake (DMI) (8.0 vs. 9.2 and 9.2 kg d -1 ) and rates of gain (1.21 vs. 1.62 and 1.56 kg d -1 ) than those fed C or S. Cattle fed S required fewer days (93.3) to reach the targeted finish (5 mm backfat) than those fed C or M (105.8 d). Monensin reduced slaughter weight and carcass weights, relative to controls (414.3 vs. 480.5 kg, and 231.2 vs. 245.8 kg, respectively). In trial 2, M (25 ppm) or S (13 ppm) were included in barley-based diets for 72 yearling steers placed in four pens equipped with radio frequency identification systems. Individual bunk attendance patterns were monitored during transition to a finishing diet, during 11 d of limit feeding the finishing diet twice daily (LF2/d), 13 d of limit feeding once daily (LF1/d), and 21 d of feeding once daily to ad libitum intake (AL1/d). Ionophore type did not affect (P > 0.10) DMI, rate of gain or efficiency of feed conversion. Bunk visits were more frequent (P < 0.05) with M than with S during transition and limit-feeding. With M, total daily attendance (TDA) at the bunk during LF1/d and AL1/d, was higher (P < 0.05) than with S, and variability in TDA was lower (P < 0.05) during LF1/d. In the present study, there was no performance advantage in providing S or M in wheat-based finishing diets. Monensin moderated feeding intensity, but this effect may have been strong enough to suppress intake and even reduce gain on the wheat-based diet. . Lors du deuxième essai, on a ajouté du monensin (25 ppm) ou de la salinomycine (13 ppm) à la ration à base d'orge de 72 bouvillons d'un an répartis dans quatre enclos dotés d'un système d'identification radio. On a surveillé les habitudes de chaque animal pendant la période où les mangeoires étaient remplies de la ration de transition puis de finition selon trois régimes : quantité restreinte de la ration de finition servie deux fois par jour pendant 11 jours (RF2/j), quantité restreinte de la ration de finition servie une fois par jour pendant 13 jours (RF1/j) et ration servie à satiété une fois par jour pendant 21 jours (AS1/j). Le type d'ionophore n'affecte pas le CMS (P > 0,10), le gain de poids ni la valorisation des aliments. Les animaux se rendent moins souvent à la mangeoire (P < 0,05) quand les aliments renferment du monensin plutôt que de la salinomycine durant la période de transition et quand il y a restriction de la quan...

Performance and bunk attendance of cattle fed steam-rolled or ground corn supplemented with laidlomycin and chlortetracycline or monensin and tylosin

“…0.80) due to antibiotic supplementation. Although both laidlomycin (Spires et al 1990) and monensin (Goodrich et al 1984) improve feed efficiency over control diets, response was similar when they were compared with each other (Galyean et al 1992). Both tylosin (Brown et al 1975;Vogel and Laudert 1994) and Table 2.…”

“…Other trials have found that laidlomycin had either no effect (Berger et al 1991;Galyean et al 1992) or a positive effect on DMI (Faulkner et al 1991). In the trial of Bauer et al (1995), 12 mg kg (1 laidlomycin reduced day-to-day variation in DMI, a measurement commonly used as an indicator of acidosis (Fulton et al 1979;Stock et al 1995;Gibb et al 2001). Chlortetracycline (35 mg kg…”

“…However, with G diets, LC reduced (2.1%; P 00.03) the frequency of daily visits (9.3 vs. 9.5), but increased (6%; P B0.001) the duration at the bunk (135.9 vs. 124.0; interaction P B0.001), resulting in increased (12.4%; P B0.001) duration per meal (15.4 vs. 13.7 min). Increased frequency of meals has previously been observed in cattle supplemented with monensin compared with control (Laudert 1995;Erickson et al 2003) or cattle fed salinomycin (Gibb et al 2001). The reduced intakes often observed with feeding monensin are typically associated with more frequent, but smaller meals, resulting in more stable intakes (Chirase et al 1992;Laudert 1995;Gibb et al 2001).…”

“…Increased frequency of meals has previously been observed in cattle supplemented with monensin compared with control (Laudert 1995;Erickson et al 2003) or cattle fed salinomycin (Gibb et al 2001). The reduced intakes often observed with feeding monensin are typically associated with more frequent, but smaller meals, resulting in more stable intakes (Chirase et al 1992;Laudert 1995;Gibb et al 2001). Daily deviation in time at the bunk was affected by medication (P B0.001), processing (P B0.001), and their interactions (P 00.02).…”

“…The effect of ionophores on feeding behaviour may also contribute to their efficacy. Monensin reduced eating rates (Chirase et al 1992), meal size (Gibb et al 2001) and variation in intake . Oral antibiotics used to reduce liver abscesses target specific bacterial populations, such as Fusobacterium necrophorum and Actinomyces pyogenes, that enter the portal circulatory system through lesions in the ruminal epithelium.…”