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Supplementation of DHA-Gold pre- and/or post-natally to goat kids modifies in vitro methane production and rumen morphology until 6 months old.

08:00 EDT 30th July 2018 | BioPortfolio

Summary of "Supplementation of DHA-Gold pre- and/or post-natally to goat kids modifies in vitro methane production and rumen morphology until 6 months old."

This study aimed to investigate the effect of pre- and/or post-natal supplementation of a dry whole cell algae (DHA-Gold) to goat kids, on in vitro methane (CH4) production, animal growth and rumen morphology at the age of 6 months. Furthermore, the in vitro retreatment effect of DHA-Gold was evaluated. Twenty pregnant Saanen goats giving birth to two male kids were used. Half of these does were supplemented (D+) with 18.2 g/day of DHA-Gold in the last three weeks of pregnancy, whereas the other half was not (D-). After kidding, one goat kid per doe in both groups was supplemented daily with 0.28 g/kg of body weight (BW) of DHA-Gold (k+) until 12 weeks, whereas the other goat kids were untreated (k-). This resulted in four experimental groups D+k+, D+k-, D-k+ and D-k-. In vitro incubations were performed at the ages of 4 weeks, 11 weeks and 6 months. At the age of 6 months, goat kids were euthanized and additional incubations were performed supplementing four doses of DHA-Gold (0, 0.4, 0.8 and 1.6 mg/mL). Additionally, rumen tissue of the atrium ruminis (AR), ventral rumen (VR) and dorsal blind sac (DBS) were collected to assess rumen morphology. Rumen inocula of 4 weeks old goat kids supplemented D+ showed lower (P < 0.05) in vitro CH4 production, however, this was mainly due to a reduction in the overall fermentation, while CH4 expressed relatively to total volatile fatty acids (VFA) was higher when goat kids were treated D+ or k+. The detrimental D+ effect on VFA production diminished at 11 weeks old but remained a tendency (0.05 < P < 0.1). As for 4 weeks D+ as well as k+ supplementation of DHA-Gold stimulated rather than inhibited in vitro CH4 production expressed relative to total VFA. Supplementation of DHA-Gold either D+ or k+ decreased density, width and surface area of the ruminal papillae. However, no effect on animal growth was observed. Moreover, detrimental effects of D+ or k+ treatment on VFA production or stimulation of relative CH4 production were no longer observed at 6 months old. Nevertheless, direct exposure of DHA-Gold to 6 months old inoculum linearly (P < 0.05) decreased CH4 and VFA production, which tended (P = 0.06) to be greater when using D- rumen inoculum. Accordingly, neither D+ nor k+ DHA-Gold supplementation showed potential for reduction of rumen methanogenesis. Furthermore, this early life intervention could represent some risk for impaired rumen papillae development, which, however, did not impair animal performance.

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This article was published in the following journal.

Name: Journal of animal science
ISSN: 1525-3163
Pages:

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Diseases of the domestic or wild goat of the genus Capra.

Unstable isotopes of gold that decay or disintegrate emitting radiation. Au 185-196, 198-201, and 203 are radioactive gold isotopes.

Stable gold atoms that have the same atomic number as the element gold, but differ in atomic weight. Au-197 is a stable isotope.

A suspension of metallic gold particles.

Inorganic compounds that contain gold as an integral part of the molecule.

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