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Management and nutrition strategies to reduce the breeding season in beef cows Braz. J. Vet. Res. Anim. Sci.
MEIRELLES,Cyro Ferreira; VITTI,Dorinha Miriam Silber Schmidt; ABDALLA,Adibe Luiz.
Effects of temporary calf removal and phosphorus supplementation on conception rate in a 60 or 120 day breeding season period was observed in several trials conducted over three years on Nelore cows. Experiment I involved 47 acyclic Nelore cows with suckling calves ranging in age from 55 to 70 days. Calves were temporarily removed from their dams for 48 h at the beginning of the trial or stayed with the dams throughout the trial. The proportion of cows that cycled during the breeding season was 5 out of 25 (20%) in the control group and I5 out of 22 (68%) in the group whose calves had been removed (p<0.05). In Experiment II, 66 acyclic Nelore cows, averaging 60 ± 0.57 (x ± SE) days post-partum were allocated at random in three groups as follows: A,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nelore cows; Restricting suckling; Mineral supplements; Conception rate.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95961998000300010
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Evaluation of extraction methods for progesterone determination in rabbit (Oryctolagus cuniculus) feces by radioimmunoassay Braz. J. Vet. Res. Anim. Sci.
KORNDÖRFER,Clotilde Maria; MEIRELLES,Cyro Ferreira; BUENO,Ives Cláudio da Silva; ABDALLA,Adibe Luiz.
The purpose of this study was to find a practical procedure for the extraction of progesterone (P4) from feces and to determine if the P4 plasma profiles during pregnancy were reflected in the total fecal P4 of pregnant rabbits. The rabbit was used as model for the techniques. Plasma and feces were collected from 11 rabbits during a period of 42 days. Three different methods of P4 extraction were used. The total P4 was measured by solid-phase radioimmunoassay (RIA) with 125I-P4 as the tracer. Results suggested that it was possible to extract total P4 from rabbit feces with methanol and petroleum ether. Plasma and fecal P4 profiles were compared for both pregnant and ovariectomized rabbits. It was possible to differentiate total P4 extracted from day two...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Progesterone; Feces; Radioimmunoassay; Rabbit.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95961998000300004
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