Baixa dosagem de óxido de cromo para estimativa da produção fecal em bovinos

Filho, Henrique Mendonça Nunes Ribeiro; Zimermann, Francielli Cordeiro; Kozloski, Gilberto Vilmar

doi:10.1590/s0103-84782008005000014

Cited by 9 publications

(1 citation statement)

References 14 publications

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“…Milk N (g/day) was calculated as: milk yield (kg/day) × milk protein (g/kg)/6.38. Total fecal excretion (g DM/day) was estimated as: Cr 2 O 3 dose (mg/day)/(Cr 2 O 3 in feces (mg/g DM)/0.80), in which fecal recovery of the marker was assumed to be 0.80 (Ribeiro, Zimermann, & Kozloski, 2008). Herbage DM intake (kg/ day) was calculated from fecal DM excretion and iNDF content in diet components and feces as follows: [(fecal DM excretion (kg/ day) × fecal iNDF concentration (g/g DM))-(concentrate DM intake (kg/day) × concentrate iNDF concentration (g/g DM))]/herbage iNDF concentration (g/g DM).…”

Section: Calculationsmentioning

confidence: 99%

Effect of using Acacia mearnsii tannin extract as a feed additive on nutritional variables and productive performance in dairy cows grazing a temperate pasture

Orlandi

Pozo

Schiavo

et al. 2020

Animal Science Journal

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This study was carried out to evaluate the impact of including Acacia mearnsii tannin extract (TA) as a feed additive on nutrition and productive performance of dairy cows grazing a high-quality temperate pasture and receiving supplementation with a concentrate feedstuff. Fourteen multiparous Holstein cows were assigned to either of the following treatments: concentrate without or with 20 g TA/kg dry matter (DM). Concentrate intake accounted for 32% of the total DM intake. Tannin addition increased the herbage DM intake by 22% (p < .05). There was no effect of TA inclusion on milk yield, milk composition, milk nitrogen (N) excretion, milk and plasma urea-N concentration, urinary excretion of total N, urea-N, and purine derivatives. However, TA inclusion increased the N intake and retention, total N excretion in manure, fecal N to urine N ratio, and decreased the dietary N efficiency for milk production and the percentage of ingested N excreted in urine (p < .05). In conclusion, supplementing dairy cows grazing a high-quality temperate pasture with a concentrate containing 20 g TA/kg DM showed the potential of decreasing the proportion of ingested N excreted in urine without affecting the productive performance.

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Section: Calculationsmentioning

confidence: 99%

Effect of using Acacia mearnsii tannin extract as a feed additive on nutritional variables and productive performance in dairy cows grazing a temperate pasture

Orlandi

Pozo

Schiavo

et al. 2020

Animal Science Journal

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show abstract

Effects of Cr2O3 labelling dose, and of faeces sampling schedule, on faecal Cr concentration and on digestibility estimation in cattle fed high-concentrate diets

et al. 2014

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Impact of a tannin extract on animal performance and nitrogen excretion of dairy cows grazing a tropical pasture

et al. 2020

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Context Tannin extracts have been investigated as natural feed additives with the potential to decrease the enteric emission of methane and urinary N and to improve the productive performance of ruminants. However, the impact of this additive in dairy cattle grazing tropical grass pastures has not been extensively evaluated. Aims To evaluate the impact of the Acacia mearnsii bark extract (TA) on productive and nutritional variables in dairy cows grazing a Cynodon dactylon pasture and receiving supplementary corn silage and concentrate. Methods Fourteen multiparous Holstein dairy cows were assigned in a randomised block design to either of the following two treatments: concentrate without TA (control) or with 10 g of TA/kg dry matter (DM). The concentrate and corn silage accounted for ~0.30 and 0.30 of total DM intake respectively. Key results The dietary concentration of TA was 2.9 g/kg DM and it did not affect nutrients intake, milk production and composition, rumen microbial protein synthesis, plasma urea concentration or faecal N excretion. Total N and urea N excreted in urine were higher, whereas total N excreted in manure tended to be higher in TA treatment. Conclusions No productive advantage was obtained by including TA in the diet of dairy cows grazing Cynodon dactylon pasture. Instead, it increased the excretion of labile urinary N. Implications The effect of the use of TA as a feed additive for cows fed tropical grass-based diets is negative from the environmental point of view.

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Baixa dosagem de óxido de cromo para estimativa da produção fecal em bovinos

Cited by 9 publications

References 14 publications

Effect of using Acacia mearnsii tannin extract as a feed additive on nutritional variables and productive performance in dairy cows grazing a temperate pasture

Effect of using Acacia mearnsii tannin extract as a feed additive on nutritional variables and productive performance in dairy cows grazing a temperate pasture

Effects of Cr2O3 labelling dose, and of faeces sampling schedule, on faecal Cr concentration and on digestibility estimation in cattle fed high-concentrate diets

Impact of a tannin extract on animal performance and nitrogen excretion of dairy cows grazing a tropical pasture

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