In situ rumen degradation kinetics as affected by type of pasture and date of harvest

Keim, Juan Pablo; Valderrama, Ximena; Alomar, Daniel; López, Ignacio F.

doi:10.1590/s0103-90162013000600005

Cited by 15 publications

(12 citation statements)

References 41 publications

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“…As with other studies, cultivars selected for a high sugar concentration have lower CP and NDF to counter the elevated WSC concentration [45,47]. Additionally, in agreement with the literature, it was observed in our study that grass pastures typically have less WSC, more CP and NDF concentrations, but similar OM and NDF digestibility in autumn, compared with spring [40,48].…”

Section: Chemical Composition and In Vitro Gas Production Of Foragesupporting

confidence: 92%

“…The chemical composition of treatments is similar to values reported in autumn and spring for grass pastures in humid temperate regions [13,40]. However, the concentrations of WSC observed in this study for both cultivars, especially in the high sugar treatment (322 and 343 g/kg for autumn and spring, respectively) were greater than what is commonly reported for PRG pastures (74 to 243 g/kg) [41].…”

Section: Chemical Composition and In Vitro Gas Production Of Foragesupporting

confidence: 84%

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In Vitro Fermentation Patterns and Methane Output of Perennial Ryegrass Differing in Water-Soluble Carbohydrate and Nitrogen Concentrations

Rivero

Keim

Balocchi

et al. 2020

Animals

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The objective of this study was to determine the effect of perennial ryegrass (PRG) forages differing in their concentration of water-soluble carbohydrates (WSC) and crude protein (CP), and collected in spring and autumn, on in vitro rumen fermentation variables, nitrogen (N) metabolism indicators and methane (CH4) output, using a batch culture system. Two contrasting PRG pastures, sampled both in autumn and spring, were used: high (HS) and low (LS) sugar pastures with WSC concentrations of 322 and 343 g/kg for HS (autumn and spring), and 224 and 293 g/kg for LS in autumn and spring, respectively. Duplicates were incubated for 24 h with rumen inocula in three different days (blocks). Headspace gas pressure was measured at 2, 3, 4, 5, 6, 8, 10, 12, 18, and 24 h, and CH4 concentration was determined. The supernatants were analysed for individual volatile fatty acids (VFA) concentrations, and NH3-N. The solid residue was analysed for total N and neutral detergent insoluble N. Another set of duplicates was incubated for 4 h for VFA and NH3-N determination. The HS produced more gas (218 vs. 204 mL/g OM), tended to increase total VFA production (52.0 mM vs. 49.5 mM at 24 h), reduced the acetate:propionate ratio (2.52 vs. 3.20 at 4 h and 2.85 vs. 3.19 at 24 h) and CH4 production relative to total gas production (15.6 vs. 16.8 mL/100 mL) and, improved N use efficiency (22.1 vs. 20.9). The contrasting chemical composition modified in vitro rumen fermentation tending to increase total VFA production, reduce the acetate:propionate ratio and CH4 concentration, and improve N use efficiency through lower rumen NH3-N.

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Section: Chemical Composition and In Vitro Gas Production Of Foragesupporting

confidence: 92%

Section: Chemical Composition and In Vitro Gas Production Of Foragesupporting

confidence: 84%

In Vitro Fermentation Patterns and Methane Output of Perennial Ryegrass Differing in Water-Soluble Carbohydrate and Nitrogen Concentrations

Rivero

Keim

Balocchi

et al. 2020

Animals

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“…The degradation rate of NDF in the rumen was higher than the degradation rate of ADF [18]. The results are shown in Table -3.…”

Section: Discussionmentioning

confidence: 84%

Assessment of the nutritive value of corn stover and king grass in complete feed on Ongole steer calves productivity

2020

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Aim: This study aimed to assess the nutritional values of corn stover and king grass (Pennisetum purpupoides) in complete feed on the productivity of male Ongole steer calves. Materials and Methods: This study was conducted in two steps: Cattle adaptation and data collection. Cattle adaptation was carried out for 2 weeks, and the cattle were fed the experimental feed. The experimental feed was formulated into five combinations: R1 (50% king grass); R2 (12.5% corn stover +7.5% king grass 50% concentrate); R3 (25% corn stover+25% king grass); R4 (37.5% corn stover+12.5% king grass); and R5 (50% corn stover). All experimental feeds were added with 50% concentrate. Data were collected in five intervals, and each interval was of 4 weeks. In every interval, weight gain and digestibility were measured every day, beginning from the 4th week by collecting feces. Dry matter (DM), organic matter (OM), crude protein (CP) digestibility, neutral detergent fiber (NDF), acid detergent fiber (ADF), body weight gain, and feed conversion data were analyzed. Results: R4 and R5 treatment significantly increased (p<0.05) the feed nutritional value and weight gain of male Ongole steer calves. Interestingly, treatment with R4 had the maximum increase (p<0.05) on the digestibility value of each variable: DM, 68.85%; OM, 71.89%; CP, 73.90%; NDF, 59.10%; ADF, 55.35%; and weight gain, 0.61/gr/day. Conclusion: R4 treatment found to be the best nutritional value for improving the productivity of male Ongole steer calves.

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“…The HHM treatment was generated by delaying the regrowth period before the start of the study in relation to the regrowth period of MHM (+15 days of regrowth), which may influence fiber concentration in the pasture and, consequently, its digestibility [2,28]. However, the higher content of pre-grazing ADF and during the first 120 min of the first GS in HHM did not affect the concentration of DOMD, as fiber digestibility in a vegetative leafy spring pasture is high (>800 g/kg) and therefore an increase in ADF does not necessarily result in lower DOMD [29]. According to Chapman et al [30], the decline in the digestibility of the pasture is more related to the progress of the growing season and, therefore, by the location of the leaves insertion points on the tiller axis during the pasture growth cycle.…”

Section: Nutritive Value Of the Pasture During The Grazing Down Procementioning

confidence: 99%

Pre-Grazing Herbage Mass Affects Grazing Behavior, Herbage Disappearance, and the Residual Nutritive Value of a Pasture during the First Grazing Session

Piña

Balocchi

Keim

et al. 2020

Animals

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During the first hours after the allocation of a grazing strip (first grazing session, GS), dairy cows eat most of the daily dry matter (DM) available. There are few studies that analyze how the grazing-down process changes the characteristics of the pasture during the first GS. The objective of this study was to evaluate the effect of two pre-grazing herbage masses (HM; medium herbage mass (MHM) and high herbage mass (HHM) on the DM disappearance, grazing behavior of dairy cows, and the residual nutritive value of a pasture during the first GS. Two groups of twelve dairy cows were used to evaluate the grazing-down process, during a period of 62 days. The pre-grazing HM modified the bite rate, bite mass, and dry matter intake during the first GS. The pre-grazing HM affected the process of herbage disappearance of the pasture, especially during the first 60 min of the GS. The nutrient selection differential for acid detergent fiber was greater for HHM compared with MHM (0.93 vs. 0.86). In conclusion, pre-grazing HM affects the structural characteristics and the residual nutritive value of the pasture. The grazing process in the first GS was modified by the HM, affecting the defoliation and the DM disappearance rate of the pasture.

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In situ rumen degradation kinetics as affected by type of pasture and date of harvest

Abstract: However, it is necessary to consider other variables that determine the productive performance such as DM intake and rumen fermentation products.

Cited by 15 publications

References 41 publications

In Vitro Fermentation Patterns and Methane Output of Perennial Ryegrass Differing in Water-Soluble Carbohydrate and Nitrogen Concentrations

In Vitro Fermentation Patterns and Methane Output of Perennial Ryegrass Differing in Water-Soluble Carbohydrate and Nitrogen Concentrations

Assessment of the nutritive value of corn stover and king grass in complete feed on Ongole steer calves productivity

Pre-Grazing Herbage Mass Affects Grazing Behavior, Herbage Disappearance, and the Residual Nutritive Value of a Pasture during the First Grazing Session

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