Vaccination and Medication Procedures for Cattle

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 BC-1001 – Revised: June, 2006
Dr. Larry W. Olson - Extension Animal Scientist

This table is useful for calculating a calf's age, a cow's calving interval, a cow's expected calving date and a cow's breeding date. The following are examples of how to use the table:

Calf Age

Weaning Date = July 1, 1996 = Day 547 + 1 for leap year = Day 548

Birth Date = November 15, 1995 = Day 319

Calf's Weaning Age = 548 - 319 = 229 days-old

Cow's Calving Interval

1996 Calving Date = March 5, 1996 = Day 429 + 1 for leap year = Day 430

1995 Calving Date = January 25, 1995 = Day 25

Cow's Calving Interval = 430 - 25 = 405 days

Cow's Expected Calving Date

1995 Breeding Date = February 10, 1995 = Day 41

Average Gestation Length for Cow's Breed = 283 days

Cow's Expected Calving Date = 41+ 283 = Day 324 = November 20, 1995

Cow's Breeding Date

1996 Calving Date = March 5, 1996 = Day 429 + 1 for leap year = Day 430

Average Gestation Length for Cow's Breed = 283 days

Cow's Breeding Date = 430 - 283 = Day 147 = May 27, 1995

Age, Calving Interval & Gestation Table

Year 1
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 1 32 60 91 121 152 182 213 244 274 305 335
2 2 33 61 92 122 153 183 214 245 275 306 336
3 3 34 62 93 123 154 184 215 246 276 307 337
4 4 35 63 94 124 155 185 216 247 277 308 338
5 5 36 64 95 125 156 186 217 248 278 309 339
6 6 37 65 96 126 157 187 218 249 279 310 340
7 7 38 66 97 127 158 188 219 250 280 311 341
8 8 39 67 98 128 159 189 220 251 281 312 342
9 9 40 68 99 129 160 190 221 252 282 313 343
10 10 41 69 100 130 161 191 222 253 283 314 344
11 11 42 70 101 131 162 192 223 254 284 315 345
12 12 43 71 102 132 163 193 224 255 285 316 346
13 13 44 72 103 133 164 194 225 256 286 317 347
14 14 45 73 104 134 165 195 226 257 287 318 348
15 15 46 74 105 135 166 196 227 258 288 319 349
16 16 47 75 106 136 167 197 228 259 289 320 350
17 17 48 76 107 137 168 198 229 260 290 321 351
18 18 49 77 108 138 169 199 230 261 291 322 352
19 19 50 78 109 139 170 200 231 262 292 323 353
20 20 51 79 110 140 171 201 232 263 293 324 354
21 21 52 80 111 141 172 202 233 264 294 325 355
22 22 53 81 112 142 173 203 234 265 295 326 356
23 23 54 82 113 143 174 204 235 266 296 327 357
24 24 55 83 114 144 175 205 236 267 297 328 358
25 25 56 84 115 145 176 206 237 268 298 329 359
26 26 57 85 116 146 177 207 238 269 299 330 360
27 27 58 86 117 147 178 208 239 270 300 331 361
28 28 59 87 118 148 179 209 240 271 301 332 362
29 29 88 119 149 180 210 241 272 302 333 363
30 30 89 120 150 181 211 242 273 303 334 364
31 31 90 151 212 243 304 365
Year 2
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 366
397 425 456 486 517 547 578 609 639 670 700
2 367 398 426 457 487 518 548 579 610 640 671 701
3 368
399
427
458 488 519 549 580  611 641 672 702
4 369
400
428 459
489 520 550 581 612 642 673 703
5 370
401 429 460 490 521 551 582 613 643 674 704
6 371   402
430 461
491 522 552 583 614 644 675 705
7 372 403  431
462
492 523 553 584 615 645 676 706
8 373  404 432 463 493 524 554 585 616 646 677 707
9 374 405 433 464 494 525 555 586 617 647 678 708
10 375 406 434 465 495 526 556 587 618 648 679 709
11 376 407 435 466 496 527 557 588 619  649 680 710
12 377 408 436 467 497 528 558 589 620 650 681 711
13 378 409 437 468 498  529 559 590 621 651 682 712
14 379 410 438 469
499 530 560 591 622 652 683 713
15 380 411 439 470 500 531 561 592 623 653 684 714
16 381 412
440
471 501
532
562 593 624 654 685 715
17 382 413
441 472 502 533 563 594
625 655 686 716
18 383 414 442 473 503 534 564 595 626 656
687 717
19 384 415 443 474 504 535 565 596 627 657 688 718
20 385 416 444 475 505 536 566 597 628 658 689 719
21 386 417 445 476 506  537
567 598 629 659 690 720
22 387 418 446 477 507 538 568
599 630 660 691 721
23 388 419 447 478 508  539 569 600
631 661 692 722
24 389 420 448 479  509 540 570 601 632 662 693 723
25 390 421 449 480 510  541 571 602 633 663 694 724
26 391 422 450 481 511 542 572 603 634 664 695 725
27 392 423  451 482 512 543 573 604 635 665 696 726
28 393 424 452 483 513 544 574 605 636 666 697 727
29 394 453 484 514 545 575 606  637 667 698 728
30 395 454 485 515 546 576 607 638 668 699 729
31 396 455 516 577 608 669 730

For leap year, add 1 day to all dates after February 29. Example, March 1, 1996 is day 61 rather than day 60.

For Additional Information Contact:

Dr. Larry W. Olson
Extension Animal Scientist
Edisto Research & Education Center
64 Research Rd.
Blackville, SC 29817
Email: LOLSON@clemson.edu
Phone: 803-284-3343 ext 231
Fax: 803-284-3684