Feed Intake and Digestion by Beef Cows Fed Prairie Hay with Different Levels of Soybean Meal and Receiving Postruminal Administration of Antibiotics

Stokes, Sandra R.; Goetsch, A.L.; Jones, Amy Little; Landis, K. M.

doi:10.2527/jas1988.6671778x

Cited by 30 publications

(26 citation statements)

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“…This result is in agreement with the data obtained from dairy cows indoors [44,47] and at pasture [ 14]. In contrast, Meijs [31] and Kibon [ 18,19,25,50] …”

Section: Effect Of Carbohydrate Supplementationsupporting

confidence: 80%

Article

Delagarde¹,

Peyraud²,

Delaby³

1999

Ann. Zootech.

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-The effect of concentrate composition on intake, grazing behaviour and ruminal fermentation was studied on dairy cows strip-grazing on perennial ryegrass swards receiving a low level of nitrogen (N) (ruminal ammonia: 0.8 mmol.L-I ; blood urea: 1.2 mmol-L-I ). WHE and MSH had no effect on the level of herbage intake, while total digestible OM intake was increased by 2.0 kg. Carbohydrate supplementation had no effect on grazing behaviour or on the intensity of ruminal fermentation. The SBM concentrate clearly increased herbage intake by way of improved ruminal digestion due to the input of N. Supplementation with SBM increased ruminal ammonia (+0.7 mmol-L-1 ), total volatile fatty acids (VFA) (+14 mmol!L-!), as well as blood urea (+2.5 mmol-L-1 ), estimated total neutral detergent fibre (NDF) digestibility (+0.05) and OM digestibility (OMD)

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“…This result is in agreement with the data obtained from dairy cows indoors [44,47] and at pasture [ 14]. In contrast, Meijs [31] and Kibon [ 18,19,25,50] …”

Section: Effect Of Carbohydrate Supplementationsupporting

confidence: 80%

Article

Delagarde¹,

Peyraud²,

Delaby³

1999

Ann. Zootech.

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“…Embora as alterações numéricas sobre este parâmetro pareçam de pouca amplitude, ressalta-se que incrementos no deslocamento de sólidos podem ser reflexo de elevações no deslocamento de líquidos (Stokes et al, 1988) …”

Section: Resultsunclassified

Níveis de proteína em suplementos para terminação de bovinos em pastejo durante o período de transição Seca/Águas: digestibilidade aparente e parâmetros do metabolismo ruminal e dos compostos nitrogenados

et al. 2005

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RESUMO -Avaliaram-se aspectos das digestibilidades aparente total e parcial e parâmetros do metabolismo ruminal e dos compostos nitrogenados em novilhos mestiços suplementados durante a fase de transição entre os períodos seco e chuvoso. Foram utilizados cinco novilhos mestiços holandês x zebu com idade e peso médios iniciais de 24 meses e 304 kg, manejados em cinco piquetes de B. decumbens (0,34 ha). Foram fornecidos suplementos (4 kg/animal/dia) constituídos por fubá de milho, grão de soja integral, uréia, sulfato de amônia e mistura mineral, sendo formulados para apresentarem níveis de 12; 16; 20 e 24% de proteína bruta (PB), com base na matéria natural. O experimento foi conduzido em quatro períodos experimentais de 21 dias, sendo analisado por delineamento em quadrado latino 4x4. O quinto animal foi mantido sem suplementação e utilizado como medida de comparação descritiva (SAL). Não foram observados efeitos da composição dos suplementos sobre a digestibilidade total e parcial da matéria seca, matéria orgânica (MO) e fibra em detergente neutro e sobre os fluxos abomasais de nitrogênio (N) total, amoniacal e microbiano (NMIC). Os níveis de N amoniacal ruminal foram incrementados linearmente pela elevação dos níveis de PB dos suplementos. A eficiência de síntese microbiana apresentou valor médio de 17,5 g NMIC/kg MO fermentada no rúmen (MOFR) para os suplementos, sendo superior a SAL (10,6 g NMIC/kg MOFR). A elevação dos níveis de PB dos suplementos incrementou cubicamente a excreção urinária de uréia.Palavras-chave: capim-braquiária, compostos nitrogenados, nitrogênio amoniacal ruminal, digestibilidade parcial, pH ruminal Effects of Feeding Different Protein Levels of Supplements to Finishing Cattle in Pasture During the Dry to Rainy Transition Season on Apparent Digestibility and Metabolism of Ruminal and Nitrogenous CompoundsABSTRACT -The objective of this trial was to evaluate ruminal, intestinal, and total tract apparent digestibilities of nutrients as well as metabolism of ruminal and nitrogenous compounds in supplemented finishing cattle during the drought to rainy transition season. Five Holstein x Zebu steers averaging 304 kg of live weight and 24 months of age located in five paddocks (0.34 ha each) of Brachiaria decumbens were used in this trial. The supplements fed (4 kg/animal/day) contained ground corn, whole soybean, urea, ammonium sulfate, and minerals and were formulated to yield, on as fed basis, 12, 16, 20, and 24% of crude protein (CP). Four animals were assigned to a 4 x 4 Latin square with experimental periods lasting 21 days. The remaining animal was not supplemented and was used for comparative purposes (CONT). No significant differences in ruminal, intestinal, and total tract apparent digestibilities of dry matter, organic matter, and neutral detergent fiber were observed by increasing the CP contents of the supplements. Similarly, abomasal flows of total nitrogen, ammonia nitrogen, and microbial nitrogen (MICN) did not differ when the CP contents of the supplements were increased. Ho...

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“…Research data indicates microbial efficiency is also reduced with lesser quality forages as a slower rate of passage results in slower microbial turnover and elevated microbial maintenance requirements. The Subcommittee on Beef Cattle Nutrition (NRC, 1996) reviewed 5 studies (Stokes et al, 1988;Krysl et al, 1989;Hannah et al, 1991;Lintzenick et al, 1993;Villalobos, 1993) to evaluate microbial efficiency at various diet digestibilities. Across experiments, diet OM (DOM) disappearance ranged from 49.8 to 64.7%.…”

Section: Review and Discussionmentioning

confidence: 99%