195 Standardized ileal digestible lysine intake by gilts should be increased in late gestation to maximize whole-body nitrogen retention, piglet birth weight, and subsequent milk yield
Notice bibliographique
Résumé
Abstract One hundred fifty-seven gestating gilts were used to determine the standardized ileal digestible (SID) lysine (protein) intake in late gestation necessary to maximize whole-body N retention, piglet birth weight, and subsequent milk yield. On d 90 of gestation, gilts were assigned to one of seven isoenergetic diets with equally spaced and increasing SID lysine (protein) contents that ranged from 70 to 160% of NRC-(2012) estimated requirements, using soybean meal to supply additional lysine (13.3 to 30.5 g SID lysine per day; n=~22). Between d 105 and 108 of gestation, a N-balance was completed using total urine collection and fecal grab-sampling. After farrowing, all sows received a standard lactation diet until weaning (d20±1). Colostrum was collected (n=~14) ~24h after birth of the first piglet, confirmed by video recordings, and milk was collected on d 18 of lactation (n=~15). Linear and quadratic contrasts were constructed. Using the Bayesian information criteria to assess best fit, the linear broken line model was selected to determine optimal SID lysine (protein) intake. Gilt body weight gain in late gestation increased and body weight loss in the subsequent lactation tended to increase with increasing SID lysine (protein) intake (linear; P<0.001 and P=0.086, respectively). The gain in backfat depth during late gestation tended to decrease with increasing SID lysine (protein) intake (linear; P=0.067), but backfat depth loss during the subsequent lactation was not influenced by SID lysine (protein) intake. Nitrogen intake (52.5 to 79.5±0.9 g/d), excretion (29.6 to 43.8±2.1 g/d), and whole-body retention (N intake – N output; 21.1 to 36.9±2.3 g/d) increased with increasing SID lysine (protein) intake (linear; P<0.0001). Nitrogen retention was maximized at SID lysine intake of 22.0 g/d during late gestation (115% of NRC-estimated requirements). Litter size at birth (14.8±0.9) and the number of stillborns (0.7±0.3) were not affected by dietary treatment but piglet birth weight increased then decreased with increasing SID lysine (protein) intake (quadratic; P<0.01) and was maximized at SID lysine intake of 22.0 g/d during late gestation. Estimated milk yield and litter growth rate increased with SID lysine (protein) intake in late gestation (linear; P<0.05 and P=0.057, respectively). Estimated milk yield was maximized at SID lysine intake of 23.0 g/d during late gestation (120% of NRC-estimated requirements). Milk composition was not influenced by SID lysine (protein) intake in late gestation, but the dry matter content of colostrum decreased with increasing SID lysine (protein) intake (linear; P<0.01). Lactation feed intake tended to decrease then increase with increasing lysine intake (quadratic; P=0.067). Therefore, SID lysine supply in late gestating gilts should be increased by 15% above the current recommendations to maximize whole-body N retention in late gestation and piglet birth weight, and by 20% to maximize milk yield in the subsequent lactation.
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».