Factors Affecting Pregnancy Rate of Angus, Zebu and Zebu-cross Cattle

Reynolds, W. L.; DeRouen, T. M.; Moin, Saidi; Koonce, K. L.

doi:10.2527/jas1979.4861312x

Cited by 23 publications

(5 citation statements)

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“…Beef females required more services (P<.05) and were older at conception (P<.01) than dairy females. Number of services per conception in this study were higher than has been reported for some of these breed types (Wiltbank et al, 1961;Reynolds et al, 1979). Crosses involving dairy breeds generally required fewer services and were younger at con-ception than crosses involving beef breeds.…”

Section: Resultscontrasting

confidence: 69%

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Production Characters of Primiparous Females of a Five-Breed Diallel

Sacco

Baker

Cartwright

1987

Journal of Animal Science

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Data included pubertal, reproductive and lactation records of primiparous females produced in a diallel of Angus, Brahman, Hereford, Holstein and Jersey. Brahman heifers were oldest, tallest and heaviest at puberty, while Jersey heifers were youngest, shortest and lightest. Crossbred heifers were 22 d younger (P less than .01) at puberty than straightbred heifers; no significant differences were detected between the two groups for weight or height at puberty. Dairy heifers (Holstein and Jersey) required fewer services (P less than .05) to conception than beef heifers. The difference between straightbred and crossbred heifers for number of services to conception was small and nonsignificant. Rank of straightbreds for age at conception was similar to their rank for age at puberty except that Holstein required 1.2 fewer services and were younger at conception than Jersey. Crossbreds were 41 d younger (P less than .05) at conception than straightbreds. Brahman had the longest gestation length and were oldest at first calving; Jersey had the shortest gestation length and Holstein were youngest at first calving. Straightbred heifers gestated 1.3 d longer and were 45 d older (P less than .05) at first calving than crossbred heifers. Dairy females had greater peak and total milk yield than beef females (P less than .01). Overall straightbred and crossbred means for peak milk yield and total milk yield did not differ significantly.

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Section: Resultscontrasting

confidence: 69%

“…Angus x Brahman heifers required more services than the average of A and B heifers (P<.01), but did not differ for ACON (P>.05). Reynolds et al (1979) reported that A and B required more services than AB, but the difference was nonsignificant. Heterosis estimates for AH were nonsignificant.…”

Section: Resultsmentioning

confidence: 93%

Production Characters of Primiparous Females of a Five-Breed Diallel

Sacco

Baker

Cartwright

1987

Journal of Animal Science

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“…Reynolds et al (1980) reported that calves sired by A bulls bred to Brangus and Africander-Angus dams were born 22 d earlier than calves sired by Brahman bulls bred to the same types of dams. Reynolds et al (1979) found a significant 9-d longer gestation period and a lower pregnancy rate per service for Brahman sires compared with A sires, when both breeds were bred to the same types of cows. There was a significant difference in gestation length for Sand G-sired calves vs A-sired calves in the current study (285.5, 286.2 and 283.5 d, respectively); thus the 2-d difference between the S and A sires for gestation length accounted for part of the difference in Julian birthdate between the two sire breeds.…”

Section: Resultsmentioning

confidence: 77%

Reproductive Performance in Crosses of Angus, Santa Gertrudis and Gelbvieh Beef Cattle

Gotti

Benyshek

Kiser

1985

Journal of Animal Science

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Angus (A), Santa Gertrudis (S), and Gelbvieh (G) sires were mated to A and S dams to produce five mating types (A X A, S X S, S X A, A X S and G X A) in each of four calf crops. The study involved 501 matings. Overall means for the traits measured (calves born/cows exposed, Julian birthdate, calving ease, percentage of live calves at 24 h, birth weight, survival to weaning and gestation length) were 74.2%, 48.8 d, 96.4%, 33.2 kg, 95.4% and 283.8 d, respectively. Angus dams had a 14 percentage point (P less than .05) advantage over S dams for percentage of calves born/cows exposed. The effect of heterosis in crosses of A and S for percentage of calves born/cows exposed was negative (-11.1%) and approached significance. The percentage of calves born/cows exposed were 84.4, 70.4, 76.1 and 62.3 for the A X A, S X S, S X A and A X S mating types, respectively. Matings involving A sires and dams produced calves significantly earlier in the calving season than did matings involving S sires and dams. Matings involving S sires and dams produced calves with significantly longer gestation periods than matings of A sires and dams. Calving ease score and survival to weaning were not affected by breed of sire, breed of dam, age of dam, sex of calf, or the interaction of breed of sire X breed of dam. Percentage of live calves at 24 h indicated that straightbred S calves were significantly less viable at birth than the other four mating types.(ABSTRACT TRUNCATED AT 250 WORDS)

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“…Moreover, Sarder et al (1997) observed that the overall fertility was better in local nondescript cows than that in Friesian crossbred animals. Further, Reynolds et al (1979) reported variation in pregnancy rates among breeds. It is likely that genetics may influence the pregnancy rate in cows.…”

Section: Discussionmentioning

confidence: 98%

“…The productivity of cows is affected by poor genetics (Rahman et al, 1995), week herd health veterinary services and marketing access (Shamsuddin et al, 2007). Reynolds et al (1979) reported differences in pregnancy rates due to differences in breeds of cows. Fonseca et al (1983) found declined conception rate with increasing age of animals.…”

Section: Introductionmentioning

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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Factors Affecting Pregnancy Rate of Angus, Zebu and Zebu-cross Cattle

Cited by 23 publications

References 0 publications

Production Characters of Primiparous Females of a Five-Breed Diallel

Production Characters of Primiparous Females of a Five-Breed Diallel

Reproductive Performance in Crosses of Angus, Santa Gertrudis and Gelbvieh Beef Cattle

Factors Limiting the Pregnancy Rates in Artificially Inseminated Cows in Bangladesh

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