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...

On day 105 of gestation 12 pregnant sows were given isoflupredone injection, corticotropin infusion or saline infusion. Sow blood cortisol concentration increased (P<0.05) in response to corticotropin but not to isoflupredone. Blood glucose concentration remained constant in all groups. Body weig...

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...

Pig blastocysts aged 14, 15 and 18 days were divided into 15-cm segments representing tissue adjacent to the embryonic disc, an intermediate section and the tip region. Whenever total blastocyst length allowed, the intermediate segment was divided into proximal and distal portions for separate cultu...

Chicks housed at 16 degrees C were exposed to microwave or infrared heat. Microwave power density was 26, 13 or 10 mW/cmsuperscript 2. Chicks voluntarily demanded between 28 and 63% as much heat (min heat/hr) from the microwave source as from the infrared source at all power densities. There was no ...

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...

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...

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,...

A prototype 915-MHz microwave unit was designed to rewarm hypothermic piglets. Initial tests indicate that it is possible to rewarm piglets successfully from deep stages of hypothermia using 915-MHz microwaves. Rewarming did not cause any significant physiological changes in blood variables, nor did...

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, ...

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...

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...

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...

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...

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...

The factors (farm type descriptions) obtained from a previous factor analysis study were analysed using regression with prevalence estimates of enzootic pneumonia on 69 pig farms. Farms were divided on enzootic pneumonia prevalence greater or less than 10%. Multiple logistic regression analysis of t...