(1) Postpartum milk samples from 61 heifers and 24 tissues from 2 reactor cattle were culture-negative for B abortus.
(2) Mean concentrations of estrone and estradiol were greater (P less than .05) in large than in small heifers at d 200 of gestation.
(3) Age at puberty (onset of cyclic progesterone concentrations) was greatest in heifers fed Diet 1 and lowest in heifers fed Diet 5.
(4) Severe pathological changes were observed in the adrenal and thyroid glands of Zebu (Bos indicus) heifers infected with Trypanosoma congolense.
(5) However, prepubertal heifers exposed to long-day photoperiods had reduced (P less than .01) urinary N tau-methylhistidine excretion compared with heifers given short-day photoperiods.
(6) In spite of small corpora lutea and increased follicular activity, none of the prednisolone treated heifers showed signs of oestrogen influence, and the two animals slaughtered 26 days after the start of treatment, did not ovulate or show signs of oestrus.
(7) Eleven and six first-calving heifers and sixteen and nine second-calving cows also received cloprostenol + relaxin and cloprostenol + phosphate-buffered saline, respectively.
(8) Response to norepinephrine was 15, 20, 18, and 15% greater in high genetic than low genetic merit heifers and response to epinephrine was 12, 20, 14, and 50% greater in high genetic than low genetic merit heifers at 30, 60, 180, and 349 d postpartum.
(9) administration of pig relaxin (greater than or equal to 3000 U) does not effectively alter periparturient characteristics of beef heifers.
(10) Extraparenchymal tissue weight was 12 to 35% less in heifers given 16 light: 8 dark than in heifers exposed to 8 light: 16 dark.
(11) A seven months old heifer fell ill showing typical signs of acute lead intoxication.
(12) Three age groups were used: stall fed yearlings, grazing heifers and lactating cows.
(13) For heifer carcass traits from 3- to 6-yr-old dams, breed was significant (P less than .05 to P less than .01) for carcass weight, longissimus muscle area, percentage of cutability, and estimated kidney, heart, and pelvic fat.
(14) At least 9% of the respondents did not practice heifer calf vaccination whilst another 8.1% only commenced with vaccination during 1985 or later.
(15) Six Hereford heifer calves were infested with Psoroptes ovis and compared to six uninfested control calves.
(16) Two mature heifers were slaughtered on days 3, 6-7, 10-11, 16, 18-19 or on day 21 of the oesterus cycle.
(17) In L-OVXE and L-INT heifers, secretion of LH was low and unchanged during the period of dietary energy restriction.
(18) The experimental endpoint was 245 d of the treatment phase for nonpregnant and 3 wk postpartum for pregnant heifers.
(19) Herd sizes were unrestricted; however, 100 heifers were saved as replacements.
(20) One heifer from each group was ovariectomized (OVX) at 48, 56, 64 and 72 h. The fifth heifer of the INDO group was OVX at 80 h. Blood samples were collected at 0 h, every 2 h between 37 and 47 h, and at the time of each OVX to monitor plasma progesterone (P4) and luteinizing hormone (LH) concentrations.