Influência da frequência de suplementação no consumo, na digestibilidade e na fermentação ruminal em novilhos de corte mantidos em pastagem de capim-marandu

Morais, Juciléia Aparecida da Silva; Berchielli, Telma Teresinha; Queiroz, Maria Fernanda Soares; Keli, A.; Reis, Ricardo Andrade; Souza, S. F.

doi:10.1590/s1516-35982009000900027

Cited by 7 publications

(14 citation statements)

References 25 publications

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“…The results obtained in the present study agree with those found by other authors who also observed that ruminants grazing low-quality forage and supplemented with high-protein supplements showed similar dry matter intake (DMI) between frequencies of supplementation (infrequently or daily) (Canesin et al, 2007;Morais et al, 2009;Canesin et al, 2014;Morais et al, 2014). Krehbiel et al (1998) showed that DMI and the net portal and hepatic flux of nutrients in mature ewes fed low-quality forage increased in response to supplementation with 80 g CP day -1 of soybean meal, with no differences observed due to the frequency of supplement administration (once daily or every three days).…”

Section: Discussionsupporting

confidence: 92%

“…Similarly, other authors (Farmer et al, 2001;Currier et al, 2004;and Morais et al, 2009) have reported that two-day supplementation intervals (or shorter) had some or no effect on VFA. Morais et al (2009) observed that ruminal fermentation parameters (pH, NH 3 -N and VFA) in Nellore steers on Brachiaria brizantha pastures were stable when supplementation was reduced from seven to five or three times per week; they concluded that the maintenance of these parameters was important for adequate ruminal fermentation. The ruminal VFA by fermentation is directly proportional to feed digestibility, which depends on the composition of the diet and on the feed intake.…”

Section: Discussionmentioning

confidence: 69%

“…In a similar study, Morais et al (2009) also noted that the ruminal pH was not affected by the frequency of supplementation; instead, they measured higher average pH values -6.84, with a minimum of 6.5 -in Nellore steers grazing on Marandu grass and supplemented 7x, 5x and 3x per week. Likewise, Bohnert et al (2002c), Farmer et al (2001) and Beaty et al (1994) found that infrequent supplementation resulted in a lower ruminal pH compared with daily supplementation when all treated animals received supplementation, but a higher ruminal pH was observed on the days between supplementation events.…”

Section: Discussionmentioning

confidence: 75%

“…The characteristics of structure, biomass availability and forage quality were assessed by throwing five 1 m × 1 m metal squares randomly onto each paddock and cutting forage within them at the ground level. Half of the collected biomass was separated into green leaves, stems and dead material, and the rest was oven-dried (55 °C) for chemical composition and alkane analysis (Table 2) (Morais et al, 2009;Canesin et al, 2014;Morais et al, 2014).…”

Section: Methodsmentioning

confidence: 99%

“…For example, when a large dose of supplemental protein was provided, there was a lag in the ruminal degradation of the supplemental protein due to the inadequate protein fermentation caused by significant changes in the microbial population (Farmer et al, 2004). Data from the literature (Wickersham et al, 2008;Morais et al, 2009;Drewnoski and Poore, 2012) demonstrate that ruminants that are fed low-quality forage and are infrequently supplemented are capable of maintaining their performance, microbial efficiency, efficiency in utilizing dry matter, and nutrient intake compared with animals supplemented on a daily basis.…”

Section: Introductionmentioning

confidence: 99%

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Effects of supplementation frequency on the ruminal fermentation and enteric methane production of beef cattle grazing in tropical pastures

et al. 2014

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-The objective of this study was to evaluate the characteristics of ruminal fermentation and enteric methane production in beef cattle subjected to different supplementation frequencies while grazing on Brachiaria brizantha cv. Marandu pastures. Nine cattle (325±65.7 kg BW) fitted with ruminal and duodenal cannulas were used in the ruminal fermentation study, and 12 cattle (399±32.6 kg BW) were used in the enteric methane production study. The treatments included supplementation once daily, supplementation once daily except Saturdays and Sundays, or supplementation on alternate days. The supplementation was equivalent to 10 g kg −1 BW day −1 for all treatments. The design employed was completely randomized with three treatments and three replications. When all supplements were provided (day 1), no effects of supplementation frequency were observed on ruminal pH; concentration of NH 3 -N; concentration of acetic, propionic, or butyric acids; or total volatile fatty acids (VFA), but there were month effects. During the day on which only daily supplements were provided (day 2), significant differences were observed only on the molar concentration of acetic acid and total VFA; and month effects were noted on all variables. No significant differences were observed in ruminal fluid volume, dilution rate, N intake, bacterial N synthesis and enteric methane production among the studied supplementation frequencies. Differences were observed in the enteric methane production in the different months, with 85 g kg −1 of gross energy intake observed in September and 123 g kg −1 of gross energy intake observed in November. Lower supplementation frequency is a good option to lower labor costs with little or no consequences on ruminal fermentation characteristics and enteric methane production.

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