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Copper, iron, zinc and tannin concentrations throughout the digestive tract of tropical goats and sheep fed a high-fibre tannin-rich diet

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Abstract
The dry season in tropical regions urges livestock to feed on nutritionally very poor diets. It has not been explored how tropical sheep-assumed grazers-and tropical goats-intermediate browsers-cope with a high-fibre tannin-rich diet. This study was designed to determine the effects of a high-fibre and tannin-rich diet on the flow of important microminerals iron (Fe), zinc (Zn) and copper (Cu) throughout the digestive tract of tropical sheep and goats. The feeding trial was set up with twelve adult male animals, six sheep with mean body weight (BW) of 30.3 +/- 1.6 kg and six goats with mean BW of 26.4 +/- 2.2 kg. The feed consisted of 36% leaves of Millettia ferruginea, 61% hay and 3% concentrate and was offered at 3% of BW (all on dry matter (DM) basis). The total faecal collection was carried out for 7 consecutive days. At the end of the experimental period, the animals were slaughtered to collect liver and digesta samples from the gastrointestinal tract. Feed, digesta and faecal samples underwent analysis of Fe, Zn, and Cu and total tannins (TT). Goats had significantly higher reticulum Cu concentrations expressed on DM as compared to sheep. Faecal Cu concentrations were higher for goats compared to sheep. Reticulum and colon digesta Zn levels were higher in goats than sheep. Abomasum and colon Fe levels were higher in sheep than goats when expressed on DM. These results suggest differences in feed intake, micromineral absorption, secretion and excretion between sheep and goats, pointing to a divergent mineral metabolism as an adaptation to the challenge of a dry season diet having very low nutritive value.
Keywords
goats, mineral metabolism, sheep, tannins

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MLA
Biru, Biruk, et al. “Copper, Iron, Zinc and Tannin Concentrations throughout the Digestive Tract of Tropical Goats and Sheep Fed a High-Fibre Tannin-Rich Diet.” JOURNAL OF ANIMAL PHYSIOLOGY AND ANIMAL NUTRITION, vol. 105, no. 5, 2021, pp. 841–48, doi:10.1111/jpn.13518.
APA
Biru, B., van de Wiel, K., Derix, J., Tolemariam, T., Dermauw, V., Lourenco, M., & Janssens, G. (2021). Copper, iron, zinc and tannin concentrations throughout the digestive tract of tropical goats and sheep fed a high-fibre tannin-rich diet. JOURNAL OF ANIMAL PHYSIOLOGY AND ANIMAL NUTRITION, 105(5), 841–848. https://doi.org/10.1111/jpn.13518
Chicago author-date
Biru, Biruk, Kim van de Wiel, Jill Derix, Taye Tolemariam, Veronique Dermauw, Marta Lourenco, and Geert Janssens. 2021. “Copper, Iron, Zinc and Tannin Concentrations throughout the Digestive Tract of Tropical Goats and Sheep Fed a High-Fibre Tannin-Rich Diet.” JOURNAL OF ANIMAL PHYSIOLOGY AND ANIMAL NUTRITION 105 (5): 841–48. https://doi.org/10.1111/jpn.13518.
Chicago author-date (all authors)
Biru, Biruk, Kim van de Wiel, Jill Derix, Taye Tolemariam, Veronique Dermauw, Marta Lourenco, and Geert Janssens. 2021. “Copper, Iron, Zinc and Tannin Concentrations throughout the Digestive Tract of Tropical Goats and Sheep Fed a High-Fibre Tannin-Rich Diet.” JOURNAL OF ANIMAL PHYSIOLOGY AND ANIMAL NUTRITION 105 (5): 841–848. doi:10.1111/jpn.13518.
Vancouver
1.
Biru B, van de Wiel K, Derix J, Tolemariam T, Dermauw V, Lourenco M, et al. Copper, iron, zinc and tannin concentrations throughout the digestive tract of tropical goats and sheep fed a high-fibre tannin-rich diet. JOURNAL OF ANIMAL PHYSIOLOGY AND ANIMAL NUTRITION. 2021;105(5):841–8.
IEEE
[1]
B. Biru et al., “Copper, iron, zinc and tannin concentrations throughout the digestive tract of tropical goats and sheep fed a high-fibre tannin-rich diet,” JOURNAL OF ANIMAL PHYSIOLOGY AND ANIMAL NUTRITION, vol. 105, no. 5, pp. 841–848, 2021.
@article{8737271,
  abstract     = {{The dry season in tropical regions urges livestock to feed on nutritionally very poor diets. It has not been explored how tropical sheep-assumed grazers-and tropical goats-intermediate browsers-cope with a high-fibre tannin-rich diet. This study was designed to determine the effects of a high-fibre and tannin-rich diet on the flow of important microminerals iron (Fe), zinc (Zn) and copper (Cu) throughout the digestive tract of tropical sheep and goats. The feeding trial was set up with twelve adult male animals, six sheep with mean body weight (BW) of 30.3 +/- 1.6 kg and six goats with mean BW of 26.4 +/- 2.2 kg. The feed consisted of 36% leaves of Millettia ferruginea, 61% hay and 3% concentrate and was offered at 3% of BW (all on dry matter (DM) basis). The total faecal collection was carried out for 7 consecutive days. At the end of the experimental period, the animals were slaughtered to collect liver and digesta samples from the gastrointestinal tract. Feed, digesta and faecal samples underwent analysis of Fe, Zn, and Cu and total tannins (TT). Goats had significantly higher reticulum Cu concentrations expressed on DM as compared to sheep. Faecal Cu concentrations were higher for goats compared to sheep. Reticulum and colon digesta Zn levels were higher in goats than sheep. Abomasum and colon Fe levels were higher in sheep than goats when expressed on DM. These results suggest differences in feed intake, micromineral absorption, secretion and excretion between sheep and goats, pointing to a divergent mineral metabolism as an adaptation to the challenge of a dry season diet having very low nutritive value.}},
  author       = {{Biru, Biruk and van de Wiel, Kim and Derix, Jill and Tolemariam, Taye and Dermauw, Veronique and Lourenco, Marta and Janssens, Geert}},
  issn         = {{0931-2439}},
  journal      = {{JOURNAL OF ANIMAL PHYSIOLOGY AND ANIMAL NUTRITION}},
  keywords     = {{goats,mineral metabolism,sheep,tannins}},
  language     = {{eng}},
  number       = {{5}},
  pages        = {{841--848}},
  title        = {{Copper, iron, zinc and tannin concentrations throughout the digestive tract of tropical goats and sheep fed a high-fibre tannin-rich diet}},
  url          = {{http://dx.doi.org/10.1111/jpn.13518}},
  volume       = {{105}},
  year         = {{2021}},
}

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