Effects of Dietary Dried Tomato Pomace Fed to Lactating Cows as Endogenous Lycopene Source on Antioxidant and Physico-Chemical Properties of Cow Milk Yoghurt

  • Shettima, H. L.
  • Olorunsanya, A. O.
  • Abdu, S. B.
  • Zahradden, D.
Keywords: Dried tomato pomace, Endogenous lycopene, Lactating cows, yoghurt.


The study was conducted to evaluate the effects dietary dried tomato pomace as endogenous lycopene source on the antioxidant and physico-chemical properties of cow milk yoghurt. 15 lactating white fulani cows (WFC) were used for the experiment, three animals each were allotted to five dietary treatments containing dried tomato pomace as in three graded levels, (250g, 500g, and 750g) including the negative (no DTP was added) and positive control (containing 30mg standard lycopene). The animals were fed for 5 weeks, with 2 weeks adaptation period. At the end of feeding, yoghurt was processed with milk collected from the animals, and was stored at 4oC for 28 days and then evaluated for shelf stability on antioxidant activity and physico-chemical properties. Data generated were subjected to the General Linear Model (GML) procedure of SAS, differences among treatments and storage were compared using DMRT. Data for antioxidant assay (DPPH) was subjected to IC50 analysis, while others were analyzed using a simple descriptive statistic (bar charts). Physicochemical and proximate assay revealed a significant (p<0.01, p<0.05) difference in the properties of both fresh and stored yoghurts. Yoghurt syneresis (6.54 ± 0.30 to 5.18 ± 0.14), moisture (86.34 ± 0.01 to 85.30 ± 0.05) and lactose contents (2.47 ± 0.07 to 1.98 ± 0.02) decreased as the level of dietary DTP increased in the yoghurt. pH (4.54 ± 0.02 to 4.30 ± 0.06) and CP (4.21 ± 0.02 to 4.00 ± 0.01) decreased as storage period increased from 0 to 28 days, while syneresis, fat and ash contents increased, with higher values (6.84 ± 0.20, 4.15 ± 0.00, 0.81 ± 0.02) at 28 days. The total phenolic contents (TPC) (29.32 to 158.98 mg GAE/100g), DPPH radical scavenging activity (10021.18 to 98.65 µg/mL), ORAC (12.2 to 74.2%) increased, while lipid oxidation decreased (4.04 to 2.39 nmol/mL) in the experimental yoghurt samples. During storage, TPC decreased, while radical scavenging activities of DPPH increased in treated samples. In conclusion, inclusion of DTP (up to 750g inclusion level) in the diet of lactating cows can improve most of the properties in terms of antioxidant, physico-chemical, proximate and shelf life of yoghurt.


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How to Cite
Shettima, H. L., Olorunsanya, A. O., Abdu, S. B., & Zahradden, D. (2024). Effects of Dietary Dried Tomato Pomace Fed to Lactating Cows as Endogenous Lycopene Source on Antioxidant and Physico-Chemical Properties of Cow Milk Yoghurt. Nigerian Journal of Animal Science and Technology (NJAST), 6(4), 114 - 128. Retrieved from http://njast.com.ng/index.php/home/article/view/301

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