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.


Journal Details

This article was published in the following journal.

Name: Journal of animal science
ISSN: 1525-3163


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