Some Factors Affecting Reproduction in Beef Cattle

Schilling, P. E.; England, Noah Clinton

doi:10.2527/jas1968.2751363x

Cited by 13 publications

(7 citation statements)

References 2 publications

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“…Contrasting to the present finding, there is a report that fertility is the highest in cows between 4 and 9 years of age and declines after 10 years of age (Schilling and England, 1968). Moreover, Fonseca et al (1983) found that conception rate declined with increasing age of animals.…”

Section: Discussioncontrasting

confidence: 99%

Factors Limiting the Pregnancy Rates in Artificially Inseminated Cows in Bangladesh

Haque¹,

Gofur²,

Asaduzzama³

et al. 2015

International J. of Dairy Science

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The study was designed to determine the effects of breed, age, parity, feeding practice, Body Condition Score (BCS), timing of insemination, postpartum insemination interval and milk yield on first service pregnancy rates in cows (n = 308). The demographic factors were recorded by interviewing the farmers. All cows were examined for pregnancy diagnosis by rectal palpation of genital tract at 60-80 days post Artificial Insemination (AI). The pregnancy rate of different groups was compared and analyzed by Z test using SPSS software version 17. The overall pregnancy rate in cows was 52.6%. Though the age and parity of cows and milk yield did not affect significantly on pregnancy rate, the pregnancy rate was the highest in cows of 3-5 years of age (56.1%), in cows of parity 1-2 (57.4%) and in moderate yielding (2-5 liters milk/day) cows (62.1%). Balanced feeding and timing of insemination had a profound impact on the pregnancy rate of cows. The pregnancy rate in cows fed with combination of green grass, straw and concentrate was significantly (p<0.05) higher (63.5%) than cows fed only straw (38.5%). The pregnancy rate in cows with BCS 3-4 was significantly (p<0.05) higher (58.0%) than that of BCS 1.5-2 cows (35.0%). The pregnancy rate in cows inseminated at 6-12 h after the start of standing estrus was significantly (p<0.05) higher (58.8%) than those inseminated 13-24 h after start of standing estrus (40.4%). Cows with good BCS and AI at 6-12 h after the start of standing estrus are the best choice of selection for getting the best result in the first service pregnancy rate in cows.

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Section: Discussioncontrasting

confidence: 99%

Factors Limiting the Pregnancy Rates in Artificially Inseminated Cows in Bangladesh

Haque¹,

Gofur²,

Asaduzzama³

et al. 2015

International J. of Dairy Science

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“…The mean for all measures was 4.9%. Although the overall mean and means by breed group employing the same five measures were higher than reported by McDowell et al (14), 1.4% for 2-breed crosses, and .6% for backcrosses, the values from this study are generally lower than reported for Bos indicus crosses (9,18,21). On the other hand, heterosis of 20.9% for ½ E in first breeding to conception compares favorably with any other report.…”

Section: Estimates Of Heterosiscontrasting

confidence: 54%

“…When one of the parents was Zebu, the heterosis ranged from 4 to 14% higher than for crosses among European breeds (11,18).…”

Section: Introductionmentioning

confidence: 99%

Reproductive Efficiency of Jerseys, Red Sindhis, and Crossbreds

McDowell¹,

Hollon²,

Camoens³

et al. 1976

Journal of Dairy Science

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Ten measures related to breeding efficiency were used for comparisons among pure Jerseys and Red Sindhis and crossbreds with 3/4, Vz, or 1/4 European dairy inheritance (Brown Swiss, Holstein, or Jersey) at two locations. Jerseys and crossbreds were common to both herds with Sindhis only at Jeanerette. Means for age at puberty (first estrus after 12 mo) were 425 + 4.2, 434 + 6.9, 459 + 6.9, 504 + 14

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“…Confirmatory evidence was more recently reported by t FAO Project Mex/71/531. Schilling and England (1968) reported 8% higher calving in Charolais x Brahman than in Brahman cows in Louisiana, and Peacock et al (1973) found differences of 10-6 and 5-0% in favour of 3/4 and 7/8 Charolais x Brahman v. Brahman, respectively. 55 Peacock, Koger, Kirk, Hodges and Warnick (1973), Crockett (1973a and b), Cartwright (1973) and Reynolds (1973).…”

Section: Introductionmentioning

confidence: 98%

Reproductive performance of Zebu compared with Charolais × Zebu females in a humid tropical environment

Madalena

1976

Anim. Sci.

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Components of reproductive efficiency of Zebu-type and Charolais x Zebu-type (1/2, 3/4 and 7/8) females were compared. Zebus had longer mean intervals from calving to first service (57-8 days) and from calving to conception (46-0 days). Least squares means for both traits were respectively 129-8 and 145-1 days. Correspondingly, in the Charolais cross group 26-4% more cows were detected in oestrus within 180 days of calving, and 31-4% more conceived in the same period. Least squares means for these traits were respectively 80-7 and 50-5%. No significant differences were found between the two breeding types either in number of services per conception or in the percentage conceiving by artificial insemination (of those showing oestrus) both for lactating and dry females. A higher percentage of oestrus cycles of normal duration was found in Charolais cross (72-9 %) than in Zebus (63-1 %). Gestation lengths of Zebus (Indu-Brasil sires) and Charolais cross (Charolais and Simmental sires) were respectively 288-8 and 283-1 days. The main difference between breed types was the longer lactation anoestrus shown by Zebus. These were very sensitive to seasonal effects, showing a cyclical time trend with peaks of shorter anoestrous periods for cows calving in January-February-March, and longer ones for cows calving in July-August-September. Related traits followed parallel cycles. Charolais cross cows showed less variation than Zebus.

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Some Factors Affecting Reproduction in Beef Cattle

Cited by 13 publications

References 2 publications

Factors Limiting the Pregnancy Rates in Artificially Inseminated Cows in Bangladesh

Factors Limiting the Pregnancy Rates in Artificially Inseminated Cows in Bangladesh

Reproductive Efficiency of Jerseys, Red Sindhis, and Crossbreds

Reproductive performance of Zebu compared with Charolais × Zebu females in a humid tropical environment

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