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Table 1 Distribution of observations among dam age classes and among birth (TB) or birth-rearing (TBR) types for birth and weaning weights

From: Effects of birth-rearing type on weaning weights in meat sheep are systematically associated with differences in mean performance among flocks

Weight Data set Number of flocks Number of observations Effect Effect class Number of observations per class Number of observations per flock
Median Minimum Maximum
Birth Core 23 24 621 TB 1 4640 162 60 905
      2 15 718 556 269 2034
      3 4263 159 50 490
     Dam age 2 7140 242 122 889
      3 to 6 17 481 636 298 2339
     Lamb sex Females 12 165 429 218 1591
      Males 12 456 461 221 1637
  Yearling damsa 15 18 211 Dam age 1 2952 152 59 687
      3 to 6 10 465 535 183 2061
  Aged damsb 17 23 430 Dam age >6 2328 98 54 438
      3 to 6 15 134 757 302 2339
Weaning Core 28 19 476 TBR 11 5002 142 45 877
      22 14 474 410 227 1705
     Dam age 2 6166 173 89 695
      3 to 6 13 310 367 174 1581
  TBR = 33c 20 17 438 TBR 33 1577 58 30 202
      22 11 775 503 227 1705
  Yearling damsa 15 14 869 Dam age 1 2545 140 50 548
      3 to 6 8265 431 174 1581
  Aged damsb 10 11 835 Dam age >6 1230 97 53 309
      3 to 6 7444 589 286 1581
  1. aIncludes flocks from the core dataset that have at least 50 records on yearling dams. These datasets were restricted to only single and twin lambs but included lambs with 2-year-old dams. Numbers are shown only for the target and reference dam age classes
  2. bIncludes flocks from the core dataset that also have at least 50 records on > 6-year-old dams
  3. cIncludes flocks from the core dataset that also have at least 30 records for lambs with TBR = 33. This dataset was restricted to only 2-year-old and adult dams but included lambs with TBR = 11. Numbers are shown only for the target and reference birth-rearing types