Growth and carcass measurements were made on 2,411 Hereford steers slaughtered at a constant weight from a designed reference sire program involving 137 sires. A second data set consisted of ultrasound measures of backfat (USFAT) and longissimus muscle area (USREA) from 3,482 yearling Hereford cattle representing 441 sires. Restricted maximum likelihood procedures were used to estimate genetic ...

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to study the fleece characteristics of native goats in sistan and balouchestan province, fiber sample was taken from 270 females between one to three years old from khash, saravan and iranshahr cities. the differences between age groups for all fleece parameters except fleece weight were not significant. the fleece weight of two and three years old goats were 263.4 (± 7.7) and 315 (± 7.8) gr, r...

Data were collected over a period of 4 yr from bulls and heifers of two location-breed groups (East Tennessee-Polled Hereford, Cumberland Plateau-Angus). Variables measured and recorded at the time all calves were weaned (at an average age of approximately 230 d) were age (in d at time of data collection; AGE), weight (WT), visual condition score (COND), ultrasonically measured subcutaneous fat...

The objective of this research was to evaluate the effects of residual feed intake (RFI) determined under ad libitum feeding conditions on DMI and performance of yearling ewes fed either chopped or pelleted alfalfa hay. In Exp. 1, 45 ewe-lambs had ad libitum access to a pelleted grower diet for 63 d and individual DMI was determined using an electronic feed delivery system. Residual feed intake...

Story in Brief Corn steep liquor (CSL) and fermented ammoniated condensed whey (FACW) were compared to cottonseed meal (CS1\I) as protein sources f())' wintering 6 I lactating first-calf Hereford heifers and 32 yearling HerefOl'd heifers on nati\'e range. Cattle were allotted by weight and individually fed 6 days per week fill' 12 weeks one of four protein treatments: negative control (I\C). po...

An experiment involving crosses among selection and control lines was conducted to partition direct and maternal additive genetic response to 20 yr of selection for 1) weaning weight, 2) yearling weight, and 3) index of yearling weight and muscle score. Selection response was evaluated for efficiency of gain, growth from birth through market weight, and carcass characteristics. Heritability and...

Breeding values of sires resulting from selection either for reduced birth weight and increased yearling weight (YB, n = 8) or for increased yearling weight alone (YW, n = 9) were compared with each other and with sires representative of the population before selection began (BS, n = 12) using progeny testing. Reference sires (n = 6) connected these Line 1 sires with the Hereford international ...