Influence of the number of previous estrous cycles and age at first insemination in reproductive efficiency of sows / Influência da idade e do número de ciclos estrais prévios à primeira inseminação na eficiência reprodutiva de matrizes suínas

The present study investigated the influence of age and the numbers of estrus at first mating (from the second) and age at first estrus on reproductive performance of sows at first farrowing. Gilts Camborough® 25 lineage were evaluated, born between 2007 and 2012, from seven commercial farms situated in Ponte Nova MG. Data were obtained from databases of management programs PigChamp® and Agriness® . The size of the first litter was not influenced (P>0.05) by age at first insemination, age at first estrus (P>0,05) and by the number of estrus in which the gilts were inseminated the first time (P>0,05), in the seven farms. The repetition rate of estrus also was not influenced by age at first insemination (P>0,05). It is conclude for lineage evaluated, that the repetition rate of estrus and the litter size at first farrowing are not influenced by age at first estrus, as well as by age and number of estrus at first insemination. In view of these considerations, gilts should be inseminated as from the second estrus, aiming a smaller period of nonproductive days, without commitment of reproductive efficiency.(AU)

O presente estudo investigou a influência da idade ao primeiro estro e do número de ciclos prévios à primeira cobertura (a partir do segundo) no desempenho reprodutivo de matrizes no primeiro parto. Foram avaliadas 2.710 fêmeas da linhagem Camborough® 25, nascidas entre 2007 e 2012, em sete granjas comerciais situadas na região de Ponte Nova MG. Os dados foram obtidos a partir de bancos de dados dos programas de gerenciamento Pigchamp® e Agriness® . O tamanho da primeira leitegada não foi influenciado (P>0,05) pela idade à primeira inseminação, idade ao primeiro estro (P>0,05) e pelo número de estros (P>0,05) em que a marrã foi inseminada a primeira vez, nas sete granjas. A taxa de repetição de estros também não foi influenciada (p>0,05) pela idade à primeira inseminação. Pode-se concluir para a linhagem avaliada, que a taxa de repetição de estro e o tamanho da leitegada no primeiro parto não são influenciados pela idade ao primeiro estro, assim como pela idade e número de estros à primeira inseminação. Diante destas considerações, as marrãs devem ser inseminadas a partir do segundo estro, visando um menor período de dias não produtivos, sem comprometimento da eficiência reprodutiva.(AU)

Influence of the number of previous estrous cycles and age at first insemination in reproductive efficiency of sows / Influência da idade e do número de ciclos estrais prévios à primeira inseminação na eficiência reprodutiva de matrizes suínas

The present study investigated the influence of age and the numbers of estrus at first mating (from the second) and age at first estrus on reproductive performance of sows at first farrowing. Gilts Camborough® 25 lineage were evaluated, born between 2007 and 2012, from seven commercial farms situated in Ponte Nova MG. Data were obtained from databases of management programs PigChamp® and Agriness® . The size of the first litter was not influenced (P>0.05) by age at first insemination, age at first estrus (P>0,05) and by the number of estrus in which the gilts were inseminated the first time (P>0,05), in the seven farms. The repetition rate of estrus also was not influenced by age at first insemination (P>0,05). It is conclude for lineage evaluated, that the repetition rate of estrus and the litter size at first farrowing are not influenced by age at first estrus, as well as by age and number of estrus at first insemination. In view of these considerations, gilts should be inseminated as from the second estrus, aiming a smaller period of nonproductive days, without commitment of reproductive efficiency.

O presente estudo investigou a influência da idade ao primeiro estro e do número de ciclos prévios à primeira cobertura (a partir do segundo) no desempenho reprodutivo de matrizes no primeiro parto. Foram avaliadas 2.710 fêmeas da linhagem Camborough® 25, nascidas entre 2007 e 2012, em sete granjas comerciais situadas na região de Ponte Nova MG. Os dados foram obtidos a partir de bancos de dados dos programas de gerenciamento Pigchamp® e Agriness® . O tamanho da primeira leitegada não foi influenciado (P>0,05) pela idade à primeira inseminação, idade ao primeiro estro (P>0,05) e pelo número de estros (P>0,05) em que a marrã foi inseminada a primeira vez, nas sete granjas. A taxa de repetição de estros também não foi influenciada (p>0,05) pela idade à primeira inseminação. Pode-se concluir para a linhagem avaliada, que a taxa de repetição de estro e o tamanho da leitegada no primeiro parto não são influenciados pela idade ao primeiro estro, assim como pela idade e número de estros à primeira inseminação. Diante destas considerações, as marrãs devem ser inseminadas a partir do segundo estro, visando um menor período de dias não produtivos, sem comprometimento da eficiência reprodutiva.

Non-association between anti-Toxoplasma gondii antibodies and ABO blood group system

Toxoplasma gondii infects humans through the gastrointestinal tract (GIT), which elicits humoral immune response with specific antibodies. The expression of the ABO blood group glycoconjugates also occurs in this same system and may influence the human susceptibility of infection by T. gondii. The aim of the present study was to investigate the association between ABO blood group phenotypes and the presence of anti-T. gondii antibodies. Data - including age, results of serology tests for T. gondii infection and ABO blood group phenotypes - were assembled from the medical records of 1,006 pregnant women attended in the Base Hospital of the Medical School of São José do Rio Preto, Brazil, between 2001 and 2004. The chi-square test was used to compare the results with the level of significance set at 5 percent. Of the studied cases, 64.1 percent (645/1006) and 35.9 percent (391/1006) presented respectively positive and negative serology tests for anti-T. gondii antibodies. The mean age of those who tested positive was higher than those with negative serology tests (p = 0.0004). The frequencies of ABO blood group phenotypes were similar in those with and without anti-T. gondii antibodies (p = 0.35). In conclusion, the ABO blood group system is not associated with the presence or absence of anti-T. gondii antibodies.

Non-association between anti-Toxoplasma gondii antibodies and ABO blood group system

Toxoplasma gondii infects humans through the gastrointestinal tract (GIT), which elicits humoral immune response with specific antibodies. The expression of the ABO blood group glycoconjugates also occurs in this same system and may influence the human susceptibility of infection by T. gondii. The aim of the present study was to investigate the association between ABO blood group phenotypes and the presence of anti-T. gondii antibodies. Data - including age, results of serology tests for T. gondii infection and ABO blood group phenotypes - were assembled from the medical records of 1,006 pregnant women attended in the Base Hospital of the Medical School of São José do Rio Preto, Brazil, between 2001 and 2004. The chi-square test was used to compare the results with the level of significance set at 5 percent. Of the studied cases, 64.1 percent (645/1006) and 35.9 percent (391/1006) presented respectively positive and negative serology tests for anti-T. gondii antibodies. The mean age of those who tested positive was higher than those with negative serology tests (p = 0.0004). The frequencies of ABO blood group phenotypes were similar in those with and without anti-T. gondii antibodies (p = 0.35). In conclusion, the ABO blood group system is not associated with the presence or absence of anti-T. gondii antibodies.(AU)