H—29

(c) Uniformity Trials. —Grazing Behaviour: Twins show very close similarity in their average grazing behaviour. The following table gives the mean grazing, loafing, and lying times per day for 6 sets

Mean Value in Minutes for Seven Separate Twenty-four-hour Periods

(d) Uniformity Trials. —Live-weight Growth: A large amount of data has been accumulated in this herd. The following illustrates the likeness of a few randomlyselected gets of twins in their rate of growth :

Live Weight of Twin Pairs (Pounds)

73

Twins. Grazing, . Lying. loafing. Distance Walked (Yards). T. 1 .. 403 592 189 3,041 T. 2 399 591 196 3,292 T.11 .. 460 544 181 3,284 T. 12 . 451 541 193 3,199 T. 13 .. 387 607 191 2,760 T. 14 .. 400 583 202 2,926 T. 17 .. 482 542 161 3,040 T. 18 .. 473 581 131 3,087 T. 23 .. 338 596 252 2,621 T. 24 .. 343 574 269 2,822 T. 31 .. 400 603 182 3,262 T.32 .. 395 601 189 3,122

Sets. Four Weeks. Twenty-four Weeks. Forty-eight Weeks, Ninety-six Weeks.* T. 1 .. 63 245 410 723 T. 2 .. 59 235 411 704 T. 3 .. 59 287 431 642 T. 4 .. 47 267 423 663 T. 7 .. 60 285 425 667 T. 8 .. 58 283 431 653 T. 11 .. 51 276 408 637 T. 12 .. 51 279 430 649 T. 13 72 299 465 643 T. 14 72 292 481 670 T. 17 89 315 543 780 T. 18 88 327 538 792 T. 19 86 312 474 723 T. 20 80 301 471 752 T. 23 69 283 441 721 T. 24 .. 68 274 425 596 T. 25 .. 66 301 449 671 T. 26 .. 65 296 463 729 T.29 .. 71 263 439 653 T. 30 .. 64 263 450 668 * In calf; uncorrected for pregnancy.