Association between disease occurrence and fertility of dairy cows in three geographic regions of Chile.

The objective was to analyze the association between disease occurrence during early lactation and reproductive performance and survival of dairy cows in high-producing herds, under different management practices in three geographic regions of Chile. Data included 30,757 lactation records of cows calving from January 2013 to June 2014 in three different locations: Central (C) area (n = 6198 cows in eight herds), Central-South (CS) area(n = 17,234 cows in 12 herds), and South (S) area (n = 7325 cows in six herds). Data were analyzed using logistic regression and ANOVA, considering cow as the experimental unit. Covariables offered to the models included parity number, season of calving, cow and herd relative milk yield, geographic location, and management system. Average milk yield (305 ME) per cow were 12,091, 11,783, and 6852 kg for C, CS, and S regions, respectively. Time from calving to first service and time to conception were consistently greater for cows with at least one disease event within 50 days in milk (DIM), for cows that were reported lame, or for cows that had mastitis or metritis. The odds (95% confidence interval) of pregnancy at 150 DIM (P150) and the odds of survival until 150 DIM (S150) for cows that had at least one disease event within 50 DIM were 0.84 (0.79-0.91) times the odds of pregnancy and 0.25 (0.22-0.28) times the odds of survival for healthy cows. The odds of P150 for cows located in the C and CS areas were 1.56 (1.36-1.80) and 1.16 (1.04-1.30) times the odds of P150 for cows in the S area. The odds of S150 for cows located in the C and CS areas were 0.48 (0.37-0.62) and 0.54 (0.42-0.67) times the odds of S150 for cows in the S area. These data suggested that cow health status and geographic location are significantly associated with reproductive performance and survival in this population of Chilean dairy cows.

[Sexual responsibility: a key concept in the prevention of AIDS, abortion and adolescent pregnancies]. / Responsabilidad sexual: un concepto clave en la prevencion del SIDA, el aborto y los embarazos de adolescentes.

PIP: Worldwide, approximately 300,000 people have AIDS, and there are 50-100 infections for each case. Responsible sexual behavior is crucial for prevention, since sexual transmission is the principal route of contracting AIDS. The major causes of maternal mortality in the 15-39 year age group in Latin America are complications from induced abortion which is also responsible for 40% of global maternal mortality, i.e., 200,000 women die because of induced abortion complications out of 500,000 women who succumb to pregnancy- and birth-related caused annually. In the 1980s 38% of deaths in Chile were related to abortion of women who died in reproductive age. In developing countries almost 50% of hospital admissions occur because of abortion sequelae. Infant mortality is higher in 20-year old mothers giving birth compared with the 20-29 age group. 40,000 children are born/year in Chile to mothers 20. In 1980 these births made up 16.7% of all births. 45% of births of mothers 20 are illegitimate. These young mothers are often unprepared for the parental role: 80% of children hospitalized for malnutrition were children of adolescent mothers according to a survey. The Catholic Church's view opposing contraceptives and sexuality outside of marriage conflicts with contemporary opinion backed by mass media favoring sexuality as leading to personal enrichment and advocating contraception. More than 60% of boys and more than 30% of girls start sexual relations 20. Young people do not use contraceptives because of misinformation, difficulty in getting appropriate information, and male machismo. AIDS prevention mandate sex education stressing responsible sexuality with abstinence, condom use, and monogamy.^ieng