Dry Matter Degradation Kinetics of Selected Tropical Forage in Nili-Ravi Buffalo and Cholistani Cows at Heifer and Lactating Stages Using NorFor in Situ Standards

Muhammad Naeem Tahir (The Islamia University of Bahawalpur)
Zahid Khan (University College of Veterinary and Animal Sciences, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan Department of Animal Nutrition, University of Veterinary and Animal Sciences, Lahore 54000, Pakistan)
Nazir A. Khan (Department of Animal Nutrition, The University of Agriculture Peshawar, Peshawar 25130, Pakistan)
Saima Saima (Department of Animal Nutrition, University of Veterinary and Animal Sciences, Lahore 54000, Pakistan)
Zahid Kamran (University College of Veterinary and Animal Sciences, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan)
Fatma Inal (Department of Animal Nutrition and Nutritional Diseases, Selcuk University, Konya 42100, Turkey)


Current methods of ruminant ration formulation in Pakistan use foreign-based nutrient availability values. These values may not be optimal for all geographic areas, as variation in environment, agronomic factors, animal species, and diet characteristics may not be considered. The aim of present study was to establish a database of the chemical composition and dry matter degradation parameters of tropical forage commonly fed to ruminants in Pakistan and South Asian countries using Nili-Ravi buffalo and Cholistani cattle at heifer and lactating stages. Six cereal grain and four legume species were grown in 3 locations under standard agronomic conditions and sampled at booting and at 50% flowering stage for cereal and legumes, respectively. Dried and milled feeds were analyzed for chemical composition and in situ dry matter degradation parameters using 1 g samples in bags placed in the rumen of 2 Nili-Ravi buffalo heifers, 2 lactating Nili-Ravi buffaloes, 2 Cholistani heifers, and 2 lactating Cholistani cows. The forage family (cereal vs. legumes), species, and geographic location of growth significantly influenced (P < 0.001) chemical composition and in situ degradation fractions. Animal species and developmental stage showed no effect on degradation fractions (P > 0.05). Legume-by-heifer interactions significantly increased (P < 0.05), and legume-by-lactating cow interaction tended (P = 0.065), to increase the rate of degradation (Kd). The selected forages were degraded to a similar extent independent of animal species or developmental stage, and legumes are degraded at higher rates and to a greater extent than are cereals. A moderately significant relationship between Kd and effective dry matter degradability (DMD) suggests that Kd could be the single most important predictor of forage degradability in the rumen.


Animal species; Cattle feed; Dry matter degradability; Developmental stage; Tropical forage

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DOI: https://doi.org/10.30564/jzr.v1i1.151


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