Effect of true ileal digestible dietary methionine to lysine ratios on growth performance and carcass merit of boars, gilts and barrows selected for low backfat
Bibliographic record
Abstract
A total of 288 Landrace × Yorkshire boars, gilts and barrows selected for low backfat were used in two trials to determine the effect of an increased dietary ratio of true ileal digestible methionine to lysine on growth performance, carcass merit and nutrient utilization. The three experimental grower and finisher diets were: (1) barley-soybean meal diets with no supplemental amino acids as control containing true ileal digestible lysine at 0.45 and 0.36 g MJ–1 DE in grower and finisher diets, respectively, (2) the same as diet 1 with supplemental lysine to provide true ileal digestible lysine at 0.65 and 0.49 g MJ–1 DE, and supplemental threonine and methionine to give ratios of 0.7 and 0.3, respectively, to lysine on a true ileal digestible amino acid basis, and (3) the same as diet 2 with an increased true ileal digestible methionine to lysine ratio of 0.4. All diets were fed as pellets ad libitum in self-feeders, and with free access to drinking water. The ADG and FCE during the grower, finisher and overall periods were higher (P < 0.05) for diets 2 and 3 than for diet 1, but they were not different between diets 2 and 3 in boars, gilts and barrows. The lean growth rate and whole body protein accretion were also higher (P < 0.05) for diets 2 and 3 than for diet 1, but they were not different between diets 2 and 3 in boars, gilts and barrows. The apparent faecal digestibilities of dry matter and energy, as well as nitrogen retention and excretion, were similar (P > 0.05) for all the diets. The results indicated that boars and gilts in the present study may not have reached the maximum genetic potential for lean growth rate due to an inadequate feed and amino acid intake. A lack of improvement in pig performance with a higher dietary ratio of true ileal digestible methionine to lysine (0.40 vs. 0.3) indicated that the current NRC recommendations may be adequate. Key words: Pigs, amino acids, lysine, methionine, growth performance, nutrient metabolism.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".