Biomedical subjects

F Perea

Publications and source records attributed to F Perea.

4 recordsLinked to original sources

PubMed2006

Monthly variation of fertility and oestrus frequency in crossbred dual-purpose cows in three agroecological areas of the South American tropics.

The aim of this study was to examine the monthly variation of the first service conception (FSC) and oestrus frequency (OF) from 8308 artificial inseminations (AI) of 2960 crossbred dual-purpose cows on three commercial farms with improved management located in the Maracaibo Lake Basin, Venezuela. The effects of month of the year, agroecological area (from dry tropical forest to sub-humid tropical forest on the three farms), predominant breed (BT, Bos taurus; BI, Bos indicus), and season (December-April; May-August; and September-November) were considered. Data were analysed using logistic regression (FSC) and GLM (OF) from SAS. The mean FSC was 55.4% overall and 48.7%, 57.0% and 58.3% for farms A, B and C, respectively (p < 0.01). Within the three agroecological areas (farms A, B and C), the FSC was highest during the cooler and drier months of the year (season 1), while the lowest FSC was obtained during the months of highest rainfall and humidity (season 3) (53.3% vs. 37.4%; 58.5% vs. 49.0% and 63.0% vs. 52.3% on farms A, B, C, respectively; p < 0.01). In the three studied farms, OF was higher during the first 4 months of the year; with a diminishing trend towards the end of the year (p < 0.05). In general, BI cows had a higher FSC than BT cows, especially during the second half of the year, when environmental conditions were characterized by higher rainfall and humidity with lower wind velocity (58.8%a, 55.5%b and 46.4%c in season 1, 2 and 3 respectively; a,b,c p < 0.01).

Animals↗

PubMed2005

Posthemipelvectomy hernia.

We report the case of a white male who underwent a classic hemipelvectomy due to a femur fibrosarcoma with inguinal metastases, which 33 years later, developed into a posthemipelvectomy hernia in the amputation stump that impaired the use of his Canadian prosthesis. The hernia was repaired with a polypropylene mesh in a subaponeurotic position. A seroma was drained in the postoperative and it was only 2 months after the operation that he could use his prosthesis with any difficulty. A year after the operation, the hernia had not recurred. Only seven similar cases have been published, and there are only four cases with details of their correction, two with a mesh as was our case, and the rest with a primary suture of the aponeurotic borders. A brief review of the bibliography is given on this subject.

Femoral Neoplasms↗

PubMed2001

Negative balance of calcium during lactation in marginally nourished women.

Thirty-three rural Mexican women (age, 18-36y; weight, 50.3+/-3 kg; height, 148.3+/-2 cm) were studied under metabolic balance conditions. The objectives were to study the metabolic balances of calcium and phosphorus at the 1st, 3rd, and 6th months of lactation and postweaning and to determine the incorporation of calcium and phosphorus in milk. Subjects were divided into 5 groups of 5 to 10 each, representing: the 1st, 3rd, and 6th month of lactation, postweaning, and a control group of nonpregnant, nonlactating women. Metabolic balance was determined using identical diets and analysis of 24-hour urine (3 d), 72-hour feces, and 24-hour milk samples. Calcium content was determined by atomic absorption spectrophotometry and phosphorus by a colorimetric method. Calcium content in milk was similar at the 1st, 3rd, and 6th months. Positive calcium balances were observed in the control group, while balances were very negative in all lactation groups (-721.6+/-248 mg/d). Calcium urinary excretion was higher in the control and postweaning groups (P < 0.05), suggesting a regulatory mechanism to conserve calcium during lactation. No differences were observed in phosphorus content in milk at the 1st, 3rd, and 6th months. Positive balances were observed in the control and postweaning groups (331+/-139 and 87.1+/-130 mg/d, respectively, mean +/- SD), while the lactation groups presented more subjects (approximately 75%) in negative balance (mean +/- SD of -180.6+/-392 to -439+/-146 mg/d). High fecal calcium and phosphorus excretion (approximately 1,500 mg/d) likely contributed to the negative balance during lactation.

Adolescent↗

PubMedDate not supplied

[Calcium and phosphorus balance in rural lactating women in Mexico].

OBJECTIVE: To compare the balance of calcium (Ca) and phosphorus (P) between lactation and weaning, and to determine the Ca and P milk production in Mexican rural lactating women. METHODS: Thirty-six women aged 18-36 y, weight 49 +/- 3 kg and height 148 +/- 2 cm, were divided in six groups: four groups of lactation (1st, 3rd, 6th and 12th month) one post-weaning group and one of non pregnant non lactating women. The balance studies were performed collecting duplicate diets, 24 h urine for 3 days, 72 h feces and 24 h milk samples for 2 days. The Ca content was determined by atomic absorption spectrophotometry and P by the molybdate method. RESULTS AND CONCLUSIONS: Ca content in milk was higher in the 3rd month of lactation. The Ca balances were negative in all lactation groups (789 +/- 165 mg/d). Ca urinary excretion was lower in the lactating group (p < 0.05) suggesting a regulatory mechanism to conserve Ca during lactation. No differences were observed in the P content in milk and positive balances of P were observed in the non lactating and the post-weaning groups, whereas they were negative in the lactation groups (115 to 475 mg/d). High fecal Ca and P excretion (approximately 1300 mg/d) was observed, which contributed to the negative condition of the balance during lactation. The production of Ca and P in the milk of these rural women was similar to the one seen in rural and urban groups in Africa, Asia, Europe and the U.S.

Adult↗