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Evaluating the Adequacy of the CNCPS Model

Evaluating the Adequacy of the CNCPS Model. Luis Orlindo Tedeschi Bertha Rueda- Maldonado Francisco “Paco” Juárez-Lagunes. Mexican dual-purpose lactating cow evaluation. BASE DE DATOS. BASE DE DATOS. Digestion Rate of NDF-N in Tropical Forages. F.I. Juarez, A.N. Pell, and J.B. Robertson.

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Evaluating the Adequacy of the CNCPS Model

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  1. Evaluating the Adequacy of the CNCPS Model Luis Orlindo Tedeschi Bertha Rueda-Maldonado Francisco “Paco” Juárez-Lagunes

  2. Mexican dual-purpose lactating cow evaluation

  3. BASE DE DATOS

  4. BASE DE DATOS

  5. Digestion Rate of NDF-N in Tropical Forages F.I. Juarez, A.N. Pell, and J.B. Robertson. Cornell University INIFAP

  6. Objectives • To measure the NDF-N digestion kinetics of tropical grasses. • To determine the effects of plant maturity and N fertilization on rate and extent of digestion.

  7. Table 1. NDF-N x 6.25 content (%CP).

  8. Table 2. Effect of fertilization on NDF-N x 6.25 (%CP).

  9. Table 3. Effect of Age (days) on NDF-N x 6.25 (%CP).

  10. Table 4. NDF-N x 6.25 of 4 tropical grasses (%CP).

  11. Table 5. NDF and NDF-N x 6.25 extent of digestion (%).

  12. Table 6. NDF and NDF-N x 6.25 rates of digestion (%/h).

  13. N Fertilization and CP, NDF and NDF-N x 6.25.

  14. Table 8. Effect of Age (d) on CP, NDF and NDF-N x 6.25.

  15. CP, NDF and NDF-N x 6.25 of 4 grasses.

  16. Conclusions - 1 • NDF-N as % of CP averaged 35 with a range of 10 - 60. • The NDF-N variation was primarily due to species but N fertilization and maturity also were factors.

  17. Conclusions - 2 • NDF-N is potentially ruminally available. • Extent and rate of NDF-N digestion is affected by fertilization. • NDF-N was digested faster than NDF.

  18. Requirements for accurate prediction in the tropics • Must accurately predict requirements for maintenance, growth, pregnancy, lactation, and energy reserves • Must accurately predict absorbed energy and protein feeds being fed for each specific farm condition • Tabular nutrient requirements and feed values developed in North America are not adequate for the tropics

  19. CNCPS for feed management • Develop a model to predict requirements and feed biological values on each farm • Use the model to identify the factors that are first limiting performance • Energy • Protein • Amino acids • Minerals

  20. CNCPS components for the tropics • Breed adjustments for maintenance, growth, and lactation • Tropical forages CHO and Protein fractions and digestion rates • Dry matter intake equations • Ruminal adjustment for N and branched-chain amino acids deficiencies

  21. Dual-purpose Lactating Cows • Fifty 3/4 Holstein x 1/4 Brahman lactating cows with: • Body weight = 511 kg (550 mature), Condition score = 3, and milk production = 10 kg/d • Rotational grazing Pangola grass and supplemented with 3.5 kg/d of concentrate • From Juarez Lagunes et al. (1999) in J. Dairy Sci. 82:2136

  22. Feed Composition Juarez Lagunes et al. (1999), Table 10

  23. Digestion Rates Juarez Lagunes et al. (1999), Table 10

  24. Sensitivity to NDF and Lignin 1 Lignin = 6% DM. 2 NDF = 70% DM. From Juarez Lagunes et al. (1999), Table 4 Note: ME decreases 1.25 and 0.69 of % units/% of NDF and Lignin increase, respectively

  25. Sensitivity to NDF Digestion Rate 1 CHO A and B1 @ 16%/h. Juarez Lagunes et al. (1999), Table 5

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