Response of Laying Hens to Amino Acid Intake - Nutritional Modelling for Pigs and Poultry - page 264

Table 19.4. Mean maximum egg output ( E max ), standard deviation of egg output ( s E ), mean body weight ( W ),
standard deviation of body weight ( s W ), milligrammes of amino acid required per gramme of egg output (a)
and per kilogramme of body weight (b).

Amino acid E max W a b

s E s W

Lysine 59.9 12.5 1.53 0.2 8.58 36.6

Methionine + cysteine 63.9 12.5 1.53 0.2 7.96 50.8

Threonine 64.0 12.5 1.53 0.2 6.73 37.2

Table 19.5. Optimum economic amino acid intake (mg/bird/day) as influenced by potential egg output
(g/hen/day), mean body weight (kg) and cost ratios ( k ). a

Egg output Body weight Cost ratio ( k )

Lysine 0.0013 0.0016 0.002 0.0023 0.0026 0.003 0.0033

45 1.45 685 676 667 660 655 648 644

1.55 688 680 670 664 659 652 655

1.75 696 687 678 671 666 659 655

50 1.45 728 719 709 703 698 691 687

1.55 731 723 713 707 702 695 691

1.75 739 730 720 714 709 702 698

55 1.45 771 762 752 746 741 734 730

1.55 774 766 756 750 744 738 741

1.75 782 773 763 757 752 745 741

0.0014 0.0018 0.0021 0.0025 0.0029 0.0033 0.0036

Methionine + cysteine

45 1.45 660 651 645 637 631 626 622

1.55 666 656 650 643 636 631 637

1.75 676 666 660 653 647 641 637

50 1.45 700 691 684 677 671 666 662

1.55 705 696 689 682 676 671 667

1.75 715 706 700 692 686 681 677

55 1.45 740 730 724 717 711 705 702

1.55 745 735 729 722 716 710 717

1.75 755 746 739 732 726 721 717

Threonine 0.0019 0.0024 0.0029 0.0034 0.0039 0.0044 0.0049

45 1.45 545 538 531 525 521 516 512

1.55 549 541 535 529 524 520 523

1.75 556 549 542 537 532 527 523

50 1.45 579 571 565 559 554 550 546

1.55 583 575 568 563 558 553 549

1.75 590 582 576 570 565 561 557

55 1.45 613 605 598 593 588 583 579

1.55 616 609 602 596 592 587 591

1.75 624 616 610 604 599 595 591

a k = marginal cost of amino acid (R$/mg)/marginal revenue for egg output (R$/g).

Discussion

required per gramme of egg output ( a ) and
per kilogramme of body weight ( b ). The
method used, known as the dilution tech-
nique (Fisher et al ., 1973), has been shown
to provide an accurate measure of the re-
sponse to amino acid supply from which

The main purpose of this study was to
measure the coefficients of response to three
amino acids and to compare these with pre-
viously reported coefficients. The coeffi-