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Microwave radiation (2.45 GHz) was examined as a heat source for rewarming chilled neonatal piglets. A multi-mode cavity (60 x 60 x 60 cm) was constructed of 22 gauge perforated galvanized steel. The radiation applicator was a slotted waveguide, 70 cm in length, which was located centrally 46.5 cm a...
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Eight, pregnant, primiparous sows received i.v. infusions of TRH (5 micro g/kg; TRH group) or physiological saline (0.9% NaCl; control group) from day 105 of gestation until farrowing. The plasma concentrations of thyroxine and triiodothyronine increased in sows treated with TRH. There were no diffe...
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The objective of this study was to determine if using maternal sounds, at a higher frequency, associated with lactation, would indirectly influence milk production by the sow, thus increasing litter weight. The litters of 36 crossbred sows were allocated into 4 experimental groups. The study was div...
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The effect of oestrogens on piglet viability was determined by recording the birth to suckling interval. Starting on day 109 after mating, daily blood samples were obtained from 15 Yorkshire sows. Immediately after birth, blood samples were taken from the umbilical cord and the vena cava of piglets,...
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Four groups of six 28-day-old piglets (three male, three female) were assigned to each of four floors, bedded concrete, bare concrete, perforated metal or raised rubber-coated metal. Each pen was equipped with a microswitch which, when pushed, turned on three 250-W infrared lamps suspended 42 cm abo...
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Fifteen pregnant primiparous sows were infused i.v. with either 0 (T40), 25 (T425) or 50 (T450) mg thyroxine (T4)/day between days 102 and 112 of gestation. Piglets were observed for the birth to suckling interval (BTS) during the first 6 h of life. At 6 h, pre-determined piglets were subjected to a...
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A clear understanding of the role of different papillae in the pig may permit the development of a more palatable diet, thus, better utilizing anatomical structures and morphological characteristics to enhance health and productivity in this domestic species. The study used ten healthy market-size, ...
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In 4 trials, 408, 320, 160 and 400 one-day-old [male] chicks were housed on litter in pens measuring 1.8 x 2.4 m. Eight pens were used for each trial. For the first 6 days, temp. was maintained at 28 degrees C and on day 7 reduced to 16 degrees . Four pens were equipped with microswitches; the remai...
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Hereford steers, average weight 230+or-23 kg, in a 28-day trial period, had access to an individual electronically controlled Calan Broadbent feeder or to 3 or 4 feeders (groups A, B and C, respectively). The steers were fed grass legume silage ad libitum with fresh silage added 4 times daily. 24 ho...
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From day 104 to 114 after mating, 7 sows received daily intravenous infusions of ACTH at 1 IU/kg while 6 sows received daily infusions of metyrapone at a dose decreasing stepwise from 5 mg/kg on day 104 to 1 mg/kg on day 108, followed by saline until day 114. Saline was infused into 5 control sows. ...
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An experiment was conducted to establish oestrogen levels in piglet serum up to 13 h after birth. Treated piglets were given an injection of oestradiol benzoate into the vena cava immediately after birth, and controls were similarly injected with saline solution. Blood samples were obtained frequent...
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Sows were infused with corticotropin (ACTH) at 1 IU/kg body wt per day in 1 litre saline, or with the same volume of saline, from the 104th day of gestation. In piglets from both groups of sows, blood cortisol decreased significantly after birth, while glucose increased within 2 h. The total number ...
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Twelve pregnant primiparous sows were catheterized on day 102 of gestation and randomly allocated to receive ACTH (days 112-113 of gestation [2d], days 105-parturition [10d]) or saline. At parturition the 3rd, 4th, 6th and 7th piglet born alive were sacrificed either at birth or at 6 h. The later gr...
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The effects of prenatal adrenal stimulation and synthetic glucocorticoid supplementation on development of the gastro-intestinal tract of the piglet were investigated. Twelve pregnant sows were treated with either ACTH infusion, Isoflupredone injection or Saline between days 105 and 112 of gestation...
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Chicks, 8 days of age, were housed in a wind tunnel at temperatures from 12 degrees to 28 degrees C in increments of 4 degrees C. The tunnel was equipped with a microswitch, an infrared bulb located above the switch, and a small electric fan controlled by a rheostat. After learning, chicks were expo...
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15 sows were maintained either at 18 degrees C, 37% RH (control) or 5 degrees C, 63% RH (cold stressed) from day 104 after mating until 6 h post partum, when cold-treated sows were moved to the 18 degrees C farrowing room. Piglets were taken from sows at birth and kept at 14 degrees C (cold) or 35 d...
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Blood samples were collected from 5 pregnant sows from day 111 after mating to farrowing and from their piglets at regular intervals between birth and 48 h of age. The time between birth and 1st suckling was recorded for each piglet. Maternal serum testosterone concentration was detectable only at t...
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Total urinary creatinine (UC) was measured three times a day from 5 days before to 4 days after parturition in 13 Yorkshire sows. Total UC remained unchanged during days 5, 4, and 3, and decreased during days 2 and 1 before parturition. After parturition, levels increased, reaching peak values on da...
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Two trials were carried out to determine the effect of manure handling systems (MHS) on the performance of growing-finishing pigs when ventilation rate was governed by temp. The first trials compared accumulated manure (1 m-deep pit) and subsequent evacuation from under slats with continuous gravity...
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In a 5 x 5 Latin square with 12-day periods, 35 yearling Hereford steers, 358+or-32 kg, were randomly assigned to one of 5 groups to estimate the effects of adding flavouring agents to grass-legume silage at feeding time. Flavouring agents chosen represented major taste groups: sweet (0.025% asparta...
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