Influence of Different Dietary Rumen Degradable Protein Concentrations on Nutrient Intake, Nutrient Digestibility, Nitrogen Balance, Blood Urea Nitrogen and Milk Yield of Lactating Beetal Goats

Akhtar, Muhammad Usman; Qayum, Abdul; Shan, Anshan; Chou, Shuli; Jo, Hyeonsoo; Shah, Syed Waqas Ali; Ishfaq, Muhammad

doi:10.17582/journal.pjz/2020.52.1.213.221

Cited by 3 publications

(2 citation statements)

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“…It is known that increased rumen intake of degradable proteins is responsible for the increase in urea concentration in milk and blood, and very little is used for milk protein synthesis (Roseler et al, 1993;Kampl and Stolla, 1995;Campanile et al, 1998;Marenjak et al, 2004;Akhtar et al, 2020). For example, Akhtar et al (2020) found the highest concentration of urea in the blood of goats fed with a meal of 70% RDP compared to those fed with 60, 50, 40 and 30% RDP. Meng et al (2016) showed that 2.5% more crude protein in the diet did not result in a higher proportion of protein in the milk, indicating the fact that excess ingested crude protein was excreted in the form of nitrogen in urine and faeces.…”

Section: Factors Influencing Milk Urea Concentrationmentioning

confidence: 99%

Urea concentration in goat milk: importance of determination and factors of variability

Ljoljić¹,

Špehar²,

Prpić³

et al. 2020

j. cent. eur. agric.

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Section: Factors Influencing Milk Urea Concentrationmentioning

confidence: 99%

Urea concentration in goat milk: importance of determination and factors of variability

Ljoljić¹,

Špehar²,

Prpić³

et al. 2020

j. cent. eur. agric.

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“…The amount of rumen degradable protein (RDP) decreases during flake processing [ 44 – 46 ], and this decrease in RDP alters the activity of microorganisms in the rumen and consequently affects the total tract CP digestibility [ 47 ]. In previous studies that used goats, CP digestibility decreases significantly as the amount of RDP in the diet decreases [ 48 , 49 ]. In addition to the high CP digestibility of ground corn, the high digestibility of EE appears to be affected by EE intake.…”

Section: Discussionmentioning

confidence: 99%

Effect of flaking on the digestibility of corn in ruminants

Kang¹,

Lee²,

Jeon³

et al. 2021

J Anim Sci Technol

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In this study, we aimed to assess the effect of flaking on the nutrient digestibility of corn grain in ruminants. In this regard, in vitro rumen fermentation, in situ rumen degradability, and in vivo metabolic experiments were performed. The automated gas production technique was used for the in vitro fermentation experiments. Six types of corn flakes with various degrees of gelatinization (32%, 41%, 48%, 66%, 86%, and 89%) were ground and incubated in rumen fluid to measure rumen fermentation characteristics and digestion rate. The in situ degradability of ground corn, whole corn, and corn flakes with 62% and 66% gelatinization was measured by incubation in the rumen of two cannulated Holstein cows. In vivo metabolic experiments were performed using 12 crossbred goats (29.8 kg ± 4.37) using a 3 × 3 Latin square design. The dietary treatments consisted of ground corn and flaked corn with 48% or 62% gelatinization. In vitro experiments showed that as the degree of gelatinization increased, the digestion rate increased linearly, while the discrete lag time decreased linearly (p < 0.05). The effective rumen dry matter degradability, determined by in situ fermentation, was 37%p lower in corn flakes than ground corn, assuming a passage rate of 6%/h (p < 0.01), and there was no difference between the two flakes. In the in vivo experiment, there was no difference in dry matter intake, average daily gain, feed efficiency, and nitrogen utilization among the treatment groups (p > 0.05); however, the crude fat digestibility was lower for corn flakes than for ground corn (p < 0.05). To summarize, the rate of fermentation of corn flakes increased as the degree of gelatinization increased. However, non-ground corn flakes had lower rumen digestibility and did not improve in vivo apparent nutrient digestibility, compared with ground corn.In contrast to the assumption that flaked corn provides more energy to ruminant animals than ground corn, we conclude that the digestibility and energy value of corn flakes are lower than those of ground corn if mastication does not sufficiently reduce the particle size of corn flakes.

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Effect of calcium salts of fatty acids and level of rumen degradable protein on nitrogen metabolism and performance of dairy cows fed corn silage-based diets

et al. 2021

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Influence of Different Dietary Rumen Degradable Protein Concentrations on Nutrient Intake, Nutrient Digestibility, Nitrogen Balance, Blood Urea Nitrogen and Milk Yield of Lactating Beetal Goats

Cited by 3 publications

References 20 publications

Urea concentration in goat milk: importance of determination and factors of variability

Urea concentration in goat milk: importance of determination and factors of variability

Effect of flaking on the digestibility of corn in ruminants

Effect of calcium salts of fatty acids and level of rumen degradable protein on nitrogen metabolism and performance of dairy cows fed corn silage-based diets

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