ArticleTropical animal health and production2025
Effects of dietary rumen-degradable protein on the growth performance, energy, and nitrogen metabolism of dairy buffalo heifers.
Article in Tropical animal health and production, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Dietary Supplementation of Concentrate Improves Lactation Performance and Immune Function in Grazing Lactating Yaks Through Changes in Rumen Microbial Population and Metabolites.Microorganisms · 2026Article
- Effects of dietary rumen-degradable protein on growth performance, nitrogen metabolism, and rumen microbiome in dairy buffalo heifers.Frontiers in veterinary science · 2026Article
- Exploratory Meta-Analysis of the Effect of Malic Acid or Malate Addition on Ruminal Parameters, Nutrient Digestibility, and Blood Characteristics of Cattle.Animals : an open access journal from MDPI · 2025Article
- Maize Silage Associated With Hay From Xerophytic Plants in Lamb Feeding: Intake, Digestibility, and Economic Feasibility.Animal science journal = Nihon chikusan GakkaihoArticle
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Authors and funding
13 authors.
Funding
Abstract
The goals of ruminant protein nutrition are to provide sufficient rumen-degradable protein (RDP) for optimizing nitrogen utilization efficiency and achieve the desired level of animal productivity, all while minimizing dietary crude protein (CP) intake. The present study aimed to examine the effects of decreasing dietary protein by reducing RDP on the growth performance, energy, and nitrogen metabolism of dairy buffalo heifers. Three diets were formulated: high RDP (H-RDP, RDP = 80.36 g/kg, CP = 15.42%), medium RDP (M-RDP, RDP = 72.79 g/kg, CP = 14.03%), and low RDP (L-RDP, RDP = 66.48 g/kg, CP = 12.87%), yielding digestible crude protein (DCP) balances of 166.07, 114.89, and 66.59 g/d, respectively. The diets were fed to 36 heifers (259.19 ± 3.93 kg) divided into three groups (12 heifers per treatment) over a 51-day trial. The results showed that when dietary RDP decreased from 80.36 g/kg to 72.79 g/kg, the average daily gain (ADG) and dry matter intake (DMI) remained stable; however, a further decrease to 66.48 g/kg resulted in a 19.12% decrease in ADG and an 6.80% decrease in DMI (P < 0.05). The feed-to-gain (F/G) ratio increased linearly with decreasing dietary RDP (P < 0.01) and was significantly lower in the M-RDP and H-RDP groups than that in the L-RDP group (P < 0.05). The apparent digestibility of CP decreased linearly (P = 0.01) and was significantly higher (P < 0.05) in the H-RDP group than in the L-RDP group. There was a linear increase in fecal nitrogen efficiency (FN)/IN, which was significantly lower (P < 0.05) in the H-RDP group than in the L-RDP group. Reducing dietary RDP linearly decreased urinary nitrogen excretion (UN) (P < 0.01) without affecting the efficiency of the retained nitrogen (RN), intake nitrogen (IN), and energy profiles. Overall, this study revealed that reducing dietary RDP (from 80.36 to 72.79 g/kg) and CP (from 15.42% to 14.03%) effectively reduced UN excretion while maintaining dairy buffalo heifer performance. Collectively, these findings suggest an optimal dietary RDP range of 72.79-80.36 g/kg for 13- to 15-month-old dairy buffalo heifers.
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