Volume: 56 Issue: 3
Year: 2025, Page: 414-417, Doi: https://doi.org/10.51966/jvas.2025.56.3.414-417
Received: Dec. 9, 2024 Accepted: Feb. 14, 2025 Published: Sept. 30, 2025
This study evaluated the effects of three total mixed rations (TMRs) with varying energy levels and RDP:RUP ratios on reproductive performance and mineral status in early lactating crossbred dairy cows over 90days. Twenty-one cows were randomly assigned to three isonitrogenous dietary treatments: G1 (60% TDN, RDP:RUP ratio 70:30), G2 (65% TDN, RDP:RUP ratio 70:30), and G3 (70% TDN, RDP:RUP ratio 60:40). Parameters assessed included days in milk at first artificial insemination, service period, pregnancy rate and serum mineral concentrations. While no significant differences were observed among the groups, the results indicated that all diets adequately supported reproductive performance and maintained mineral balance in early lactating crossbred cows.
Keywords: Energy level, RDP: RUP ratio, Reproductive performance, Serum mineral profile
AOAC [Association of Official Analytical Chemists]. 2016. Official Methods of Analysis. (20th Ed.). Association of official analytical chemists, Washington DC, 684p
Chacko, B., Mohan, K.M.S., Ally, K., Shyama, K., Anil, K.S. and Sathian, C.T. 2017. Effect of paddy straw plus nonforage fiber sources based complete rations with different levels of neutral detergent fiber on hemato-biochemical and mineral profile of lactating dairy cows. Vet. World. 10: 836–842.
Desta, A.G. 2024. The effect of crude protein and energy on conception of dairy cow: a review. Discov. Anim. 1: 29.
Goering, H.K. and Van Soest, P.J. 1970. Forage Fibre Analyses (Apparatus, Reagents, Procedures and Some Applications). Government printing office, Washington, DC, 20p.
Hasan, S., Islam, K. and Rahman, M. 2021. Physiological comparison of some serum biochemistry between lactating and non-lactating dairy cows in selected dairy farms of Dhaka district of Bangladesh. Int. J. Curr. Sci. Res. Rev.4: 53-58.
Kaneko, J. J., Harvey, J. W. and Bruss M. L. 2008. Clinical Biochemistry of Domestic Animals. (6th Ed.). Academic press, San Diego, California, pp. 873-904.
Noaman, V., Rasti, M., Ranjbari, A.R. and Shirvani, E. 2012. Copper, zinc, and iron concentrations in blood serum and diet of dairy cattle on semi-industrial farms in central Iran. Trop. Anim. Health Prod.44: 407–411.
Rani, J.K. 2021. Improving efficiency of production in early lactating dairy cows through augmentation of rumen biomass production. Ph.D thesis, Kerala Veterinary and Animal Sciences, University, Pookode, 211p.
Roche, J.F. 2006. The effect of nutritional management of the dairy cow on reproductive efficiency. Anim. Reprod. Sci. 96: 282–296.
Salo, S. 2018. Effects of quality and amounts of dietary protein on dairy cattle reproduction and the environment. J Dairy Vet Sci. 5: 1–7.
Spolders, M., Höltershinken, M., Meyer, U., Rehage, J. and Flachowsky, G. 2010. Assessment of reference values for copper and zinc in blood serum of first and second lactating dairy cows. Vet. Med. Int.2010: 1–8.
Tamminga, S. 2006. The effect of the supply of rumen degradable protein and metabolisable protein on negative energy balance and fertility in dairy cows. Anim. Reprod. Sci. 96: 227–239.
Underwood, E. and Suttle, N. 1999. The mineral nutrition of livestock. (3rdEd).CAB International, Wallingford,614p.
Van Soest, P.J., Robertson, J.B. and Lewis, B.A. 1991. Methods for dietary fiber, neutral detergent fiber, and nonstarch polysaccharides in relation to animal nutrition. J. Dairy Sci.74: 3583–3597.
Yokus, B. and Cakir, U.D. 2006. Seasonal and physiological variations in serum chemistry and mineral concentrations in cattle. Biol. Trace Elem. Res.109: 255–266.
© 2025 Sahib et al. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Sahib, L., Ally, K., Ajith, K.S., Chacko, B., Radhika, G. and Anil, K.S. 2024. Influence of dietary energy levels and protein degradability ratios on reproductive performance and serum mineral profile in early lactating cows.
J. Vet. Anim. Sci. 56 (3):414-417