H—29

thus four groups which are designated high-high (good nutrition throughout), low-low (poor nutrition throughout), high-low (good nutrition to first calving and poor nutrition thereafter), and low-high (poor nutrition to first calving and good nutrition thereafter). The results are reported in three stages —calf, yearling, and cow. Calf Stage : The weights of the two groups of calves for the past four seasons are set out in the following table

Body Weights at 31st March

The results again emphasize the value of rotating the calves ahead of the cows and thus ensuring that they always receive good, clean pasture.

Yearling Stage : The progress during the yearling stage is shown in the following table :

The differences in the two systems are illustrated by the consumption of hay, silage,, and autumn-saved pasture (A.S.P.) by yearlings, as shown hereunder: —

70

Season. Well Beared, Rotationally Grazed. Poorly Beared, Set-stocked. Difference. Number. Weight. Number. Weight. lb. lb. lb. 1944-47 74 378 80 283 95 1947-48 10 410 12 325 85 Identical twins 10 410 10 338 72

Well Reared. Poorly Reared. Differences. — 1945-47. 1947-48. 1945-47. 1947-48. 1945-47. 1947-48. Nontwins. Twins. Nontwins. Twins. Nontwins. Twins. April June September December March 389 443 519 651 703 437 494 539 688 717 408 465 520 640 682 288 310 372 539 561 312 316 413 547 558 347 359 439 547 549 101 133 147 112 142 125 178 126 141 159 61 106 81 93 133 Numbers 46 8 8 47 8 8

Consumption per Head. Group. Year. Hay. Silage. A.S.P. Cwt. Cwt. Hours. Well grown 1945-46 2 20 112 1946-47 6 11 237 1947-48 10 28 66 Poorly grown 1945-46 3 1946-47 3 1947—48 H