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High-level dietary B-vitamins in growing/finishing pigs
B vitamins are thought to have positive influence on performance, body composition and tissue vitamin contents - very important economic facors. Is this really true? A recently published study on 48 pigs gives very interesting answers...

Forty-eight growing pigs were randomly assigned to five dietary groups and penned individually.

They received a diet based on barley, wheat, corn and soya bean meal according to requirement.

The experimental groups were supplemented with 400% or 800% of vitamins B2, B6 and pantothenic acid, or 400% or 800% of biotin, while all other vitamins were administered according to requirement.

Growth performance, carcass characteristics, aspartate aminotransferase (AST), and content of vitamins in blood, liver and muscles were recorded.

Growth performance showed no influence of supplementation, while backfat thickness in the group with 800% B2/B6/pantothenic acid was significantly higher.

Content of B2 in blood, liver and muscle was similar in all groups. Content of B6 in blood and liver showed significant differences according to supplementation.

The content of vitamin B6 in muscle in the experimental groups was significantly higher than that in the control group.
The content of pantothenic acid in blood and muscle in the experimental groups was significantly higher, while in liver all groups were significantly influenced by the supplementation level.
Biotin content in liver showed no influence, but the content in plasma was significantly higher in the experimental groups and the content in muscle was significantly higher according to supplementation.

The activity of AST showed no significant influence of the dietary vitamin level, but it was obviously decreased in the groups supplemented with biotin.

The findings indicate that the dietary supplementation of vitamin B2, B6, pantothenic acid and biotin could not improve performance, but the contents in blood, liver and muscle.



Source: B. M. Böhmer, D. A. Roth-Maier (2007): Effects of high-level dietary B-vitamins on performance, body composition and tissue vitamin contents of growing/finishing pigs. In: Journal of Animal Physiology and Animal Nutrition 91 (1-2), 6–10.


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SWINE PRACTICE

Beta hydroxy beta methyl butyrate and the muscle fibre composition in growing pigsmembers
The aim of this recently online published study was to investigate the effects of excess leucine (Leu) vs. its metabolites α‐ketoisocaproate (KIC) and β‐hydroxy‐β‐methyl butyrate (HMB) on Leu metabolism, muscle fibre composition and muscle growth in growing pigs. Thirty‐two pigs with a similar initial weight (9.55 ± 0.19 kg) were fed 1 of 4 diets for 45 days: basal diet, basal diet + 1.25% L‐Leu, basal diet + 1.25% KIC‐Ca, basal diet + 0.62% HMB‐Ca. The results are very promising!

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