Porcine somatotropin and cysteamine hydrochloride improve growth performance and reduce back fat in finisher gilts
Bibliographic record
Abstract
Porcine somatotropin (pST) treatment of pigs consistently improves daily gain and feed conversion ratio but the daily injections involved can be problematic. The sulfhydryl compound cysteamine hydrochloride (CSH) increases somatotropin secretion in several species, possibly through inhibition of somatostatin secretion. Therefore, it is possible that dietary CSH supplementation may provide a dietary means of increasing pST secretion and improving growth performance in finisher pigs. Eighteen female crossbred (Large white × Landrace) gilts (59.2 kg) were allocated to one of three treatments with the respective factors being a control diet, dietary CSH (0.7 g/kg) and intramuscular pST (5 mg/day) for 5 weeks. After slaughter the whole half carcass was cut into primal cuts which were then dissected to a retail level into lean, fat, bone and rind. Over the first 2 weeks of the study daily gain was increased by both pST (+46%, P < 0.001) and CSH (+12%, P < 0.05) while feed conversion ratio was decreased by pST (–30%, P < 0.001) and CSH (–9.4%, P = 0.08) over this period. Over the entire 5 weeks there was a large and sustained increase in daily gain in pigs treated with pST (+38%, P < 0.001), while dietary CSH tended to cause a more modest increase in daily gain (+7.4%, P = 0.06). As a result, final liveweight (+10.6 and +2.0 kg, respectively) and carcass weight (+5.8 and +1.6 kg, respectively) were increased by pST and CSH. Back fat was decreased by both pST and CSH (–1.7 and 1.0 mm, respectively). Total dissectible tissue was increased by pST (+9.1%, P < 0.001) and CSH (+3.3%, P < 0.05). In pigs treated with pST, the increased tissue was primarily as lean (+11.1%, P < 0.008) and bone (+17.8%, P = 0.017), whereas an accumulation of non significant increases in lean, rind and bone was responsible for the increased dissectible tissue in the carcass of pigs supplemented with CSH. In conclusion, dietary CSH increased daily gain and carcass weight and decreased FCR and P2 backfat, with responses being most pronounced over the first 2 weeks of dietary supplementation and not as great as those caused by exogenous pST treatment.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| 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".