2024 : 7 : 15
Mehdi Hossein Yazdi

Mehdi Hossein Yazdi

Academic rank: Assistant Professor
ORCID: https://orcid.org/0000-0003-3763-6507
Education: PhD.
ScopusId: 55332944500
Faculty: Agriculture and Environment
Address: Arak University


Supplementation of n-3 fatty acid and ruminal undegradable to degradable protein ratio in young lambs raised under heat condition: Effects on growth performance and urinary purine derivatives
Alpha-linolenic fatty acid. Heat stress. Protein degradation. Pre-weaning lambs. Nitrogen metabolismAlpha-linolenic fatty acid. Heat stress. Protein degradation. Pre-weaning lambs. Nitrogen metabolism
Journal Tropical Animal Health and Production
Researchers Maryam Yavari ، Mehdi Kazemi bonchenari ، Mehdi Mirzaei ، Mehdi Hossein Yazdi


The present study evaluated the effect of supplementation alpha-linolenic fatty acid source (ALA) with different rumen undegradable to degradable protein ratios [low ratio (LR) = 26:74; high ratio (HR) = 36:64 based on CP%] on growth performance, nutrient digestibility, fecal score, animal feeding behavior, and urinary purine derivatives (PD) in young lambs during hot season. Forty 10-day-old lambs (averaging body weight of 7.9 ± 0.8 kg) were used in a completely randomized block design with a 2 × 2 factorial arrangement as following treatments (10 lambs / treatment): 1) no n-3 FA supplementation with LR diet (NALA-LR); 2) no ALA supplementation with HR diet (NALA-HR); 3) supplementation of ALA with LR diet (ALA-LR); and 4) supplementation of ALA with HR diet (ALA-HR). Results showed that ALA supplementation slightly increased feed efficiency (FE; tendency, P = 0.076), improved fecal score (P = 0.045), and reduced rectal temperature (tendency, P = 0.064) during pre-weaning period. The HR diets improved average daily gain (ADG; P < 0.01), wither height (post-weaning; P = 0.015), and final BW (P = 0.048) compared with LR diets. The greatest ADG (pre-weaning; P = 0.012), structural growth, and the lowest urinary nitrogen exertion (P = 0.043) were found in the ALA-HR treatment. No change was found for ruminal fermentation, nutrient digestibility, and animal behavior in lambs fed different experimental treatments. In summary, results indicated that concurrent feeding of ALA and high dietary RUP:RDP ratio can be recommendable that is likely due to more efficient nitrogen utilization when young lambs are raised during hot season.