PSX-26 Effect of physically effective neutral detergent fiber and starch inclusion on ruminal motility for feedlot cattle.
Notice bibliographique
Résumé
Abstract This study was designed to evaluate the effects of physically effective neutral detergent fiber (peNDF) and starch inclusion rate on ruminal motility, pool sizes, and ruminal neutral detergent fiber (NDF) turnover rate in finishing cattle. Eight ruminally cannulated Nellore steers (468.6 ± 87.5 kg), were housed in individual pens (21 m2) and assigned to a replicated 4×4 Latin square design, balanced for carryover effects. The experiment followed a 2×2 factorial arrangement of treatments, with two levels of peNDF (low: 8.5% of diet dry matter (DM) vs. high: 10.3% of diet DM) and two levels of starch inclusion (22.5% vs. 45.0% of diet DM). Concentrate feedstuffs were ground through a 4-mm sieve, and all ingredients were included in the peNDF calculation. Each period consisted of 21 days, including 14 days for adaptation and 7 days of sampling. Corn silage was harvested from a single field and chopped to a theoretical chop length of 2.0 (low peNDF) or 9.0 mm (high peNDF), and included at 20% of DM in all diets. In addition, diets contained finely ground corn grain, soybean hulls, soybean meal, citrus pulp, mineral, urea, and sodium monensin. Dry matter intake, expressed in kg/d and as a percentage of body weight, was not affected by peNDF, starch, or the interaction (P≥0.15). The peNDF inclusion did not affect (P≥0.11) neutral detergent fiber (NDF), and undigested NDF (uNDF) intake. However, feeding high peNDF increased peNDF intake (high: 1.4 vs. low: 1.1 kg; P=0.05). In contrast, feeding high starch decreased NDF (high: 3.0 vs. low: 5.2 kg; P< 0.01), peNDF (high: 2.1 vs. low: 2.3 kg; P=0.05), and uNDF intake (high: 1.4 vs. low: 1.7 kg; P< 0.01). Cattle fed low peNDF and high starch had greater rumen contraction frequency (interaction, P=0.05) when compared with the other treatments. Cattle fed low starch had greater time between contractions (high: 7.7 vs. low: 7.2 s; P=0.03), contraction duration (high: 4.3 vs. low: 3.8 s; P< 0.01), and contraction amplitude (high: 2.8 vs. low: 2.0 mmHg×s; P=0.05). Total ruminal digesta pool size (kg as is), DM, NDF, uNDF, potentially degradable NDF, and NDF passage rate were not affected by peNDF, starch, or the interaction (P≥0.14). Feeding low starch inclusion increased the NDF degradation rate (low: 3.5 vs. low: 1.0 %/h; P< 0.01). Thus, increasing theoretical chop length, a practical approach to manipulate peNDF while keeping the same dietary NDF from roughage had minimal effects on ruminal motility. However, low starch inclusion increased contraction duration, amplitude, and NDF degradation rate. These findings suggest that starch level exerts a stronger influence on ruminal motility in feedlot Nellore cattle than peNDF, with potential implications for ruminal health and nutritional strategies.
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Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| 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) | 0,000 | 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 tête enseignante, 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 ».