The influence of medroxyprogesterone acetate impregnated intravaginal sponges and pregnant mare serum (PMSG) on the length of oestrus, the length of the interval from sponge withdrawal to the beginning of oestrus, the length of the interval from the beginning of…
One hundred Karakul ewes were divided according to age in two groups of 50 ewes each. Group 1 were stimulated by teaser rams, while Group 2 served as the controls. The body masses of the ewes in both groups were…
Forty rats were used to examine the effect of plane of nutrition on the growth response of rate to castration. Rats were offered 8, 12, 16 or 20 g/rat/day of a commercial small animal feed. Castration depressed feed consumption, growth…
Thirty·two rats were used to compare the effects of administration of 0,7 mg/d testosterone or nandrolone phenylpropionate with the effects of presence of functional testes on growth and body composition of rats fed 20 g/rat/d of a commercial ration or…
Sixteen animals were used to examine intramuscular implantation of 200 mg testosterone to steers which were fed in pens on one of two planes of nutrition. During the fifty-six days after first implantation body mass gains were 0.88 and 0.78…
Twelve Friesland cows, in a Latin Square experimental design with 4 blocks and 42-day treatment periods, were subjected from the end of the second month of lactation, to 3 dietary treatments viz. a conventional system of roughage fed according to…
Weaner calves were group-fed and weaner lambs were individually fed on control standard fattening rations (Treatment 1) and compared with rations containing 20% chicken litter (Treatment 2) and 40% chicken litter (Treatment 3). With weaner calves the difference between treatments…
Antisera obtained from five rabbits, immunized against ovine luteinizing hormone (LH) were tested for their ability to combine with 125I-labelled ovine LH. Thirty five days after immunization commenced only one rabbit produced an antiserum which on dilution (1:20 000) could…
Three groups of 20 indigenous female pigs were reared from weaning on one of three planes of nutrition, estimated to provide 100% (high plane, 75% (medium plane) and 50% (low plane) of the nutrient requirements for growth and reproduction. Six…
Limitationof multi-ovulations in Karakul ewes after the use of pregnant mare serum gonadotrofien(PMSG) One hundred and eight mature Karakul ewes were randomly divided into 9 equal groups. Intravaginal sponges impregnated with 60 mg medroxy-actate progesterone (MAP, Upjohn) were inserted in…
The correlation between the average daily gain of calves and the reconception of their dams as a screening test when investigating problems with fertility in beef herds. A regression line (y = 32,025 + 140,223 x) between the average daily…
The distribution of calving Intervals of Rhodesian milk-recorded cows that completed lactations in 1969 was positively skew. The mean was approximately 400 days, but the mode was approximately 365 days. A questionnaire to farmers who participated in the milk-recording scheme…
Africander cows were inseminated with the semen of Limousine and Normande bulls and Jersey cows with that of bulls of the above two breeds as well as with Charolais semen. The male castrate progeny were compared in a fattening experiment…
