Puberty in South American Bos indicus (Zebu) cattle

Nogueira, Guilherme de Paula

doi:10.1016/j.anireprosci.2004.04.007

Cited by 108 publications

(80 citation statements)

References 50 publications

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“…These estimates of breed differences suggest that purebred Zebu and crossbred heifers with high proportion of Zebu took longer to calve for the first time than crossbred heifers with higher fractions of Angus or Blanco Orejinegro under the humid tropical conditions in Antioquia. The lower AFC found here for Angus and Blanco Orejinegro relative to Zebu was in agreement with the higher precocity of B. taurus compared to B. indicus breeds (Turner, 1980;Nogueira, 2004). However, the breed effect for Angus should be taken with caution because there were no purebred Angus cows in this population.…”

Section: Breed and Heterosis Effectssupporting

confidence: 87%

Genetic parameters and genetic trends for age at first calving and calving interval in an Angus-Blanco Orejinegro-Zebu multibreed cattle population in Colombia

2009

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Section: Breed and Heterosis Effectssupporting

confidence: 87%

Genetic parameters and genetic trends for age at first calving and calving interval in an Angus-Blanco Orejinegro-Zebu multibreed cattle population in Colombia

2009

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“…1993). The age at puberty was younger than expected to B. indicus cattle (Nogueira 2004) and a minimum body weight was shown to be necessary to reach puberty (Abeygunawardena and Dematawewa 2004).…”

Section: Discussionmentioning

confidence: 95%

Follicular Dynamics in Heifers during Pre‐pubertal and Pubertal Period Kept under Two Levels of Dietary Energy Intake

Romano¹,

Barnabé

Kastelic

et al. 2007

Reprod Domestic Animals

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The objective of this study was to characterize follicular dynamics in pre-pubertal, pubertal and post-pubertal periods, as well as the effect of high-energy intake on follicular development and age at puberty in heifers. Thirty-one Nelore (Bos indicus) heifers, 6 months old, were randomly assigned to receive two different diets: one of low (GI) and other of high dietary energy intake (GII). Animals were evaluated in relation to body weight gain by being weighed every 21 days. Heifers were evaluated every other day by real-time linear ultrasonography to characterize ovarian structures development from weaning to post-pubertal period. Blood samples were collected to determine plasmatic concentrations of progesterone by RIA method. The ovulation was determined when progesterone concentrations were >1 ng/mL in three consecutive samples, and by ultrasound images of corpus luteum; and oestrous behaviour in some animals. Age at puberty differed among heifers of GII (17.00 +/- 0.46 months) compared with heifers of GI (19.87 +/- 0.47 months; p < or = 0.05). Maximum size of the dominant follicles at pre-pubertal period was greater in GII heifers than in GI (10.52 +/- 0.33 and 9.76 +/- 0.15 mm, respectively; p < or = 0.05). As heifers approached first ovulation time, size of dominant follicle increased (11.75 +/- 0.37 mm for GI and 12.52 +/- 0.91 mm for GII; p < or = 0.05). Body weight at puberty was not different in both groups (302.33 +/- 27.31 kg for GI and 326.19 +/- 27.78 kg for GII heifers; p > 0.05). We conclude that animals receiving high dietary energy intake attained the puberty earlier and the development of follicles were different than in low dietary energy intake.

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“…The mean age of onset of puberty was 27.7± 10.4 months in this sample of Rwandan cattle, comparable to 22-36 months in South American Zebu cattle (Nogueira 2004). The average interval from parturition to first oestrus was 8.7±7.8 months compared to >150 days, which is characteristic of Bos indicus/Bos Taurus cattle, resulting in a prolonged calving index.…”

mentioning

confidence: 78%

Factors effecting reproductive performance in Rwandan cattle

Bishop

Pfeiffer

2007

Trop Anim Health Prod

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The objective of this study was to assess the reproductive performance of Rwandan cattle and determine the effects of husbandry practices on reproduction. One hundred and fifty Ankole and Crossbreed cattle from 87 farms, were body condition scored (BCS) on a scale of 1 (lean) to 5 (fat), and examined rectally for pregnancy and ovary size and structures present. Questionnaires were completed by the farmers to obtain information on husbandry and management practices. The mean age of onset of puberty was 27.7 +/- 10.4 months, the interval from parturition to first oestrus was 8.7 +/- 7.8 months, calving index was 16.8 +/- 5.2 months and 44% (95% CL 0.36-0.52) of cows examined rectally were anoestrus. Crossbred cattle reached puberty younger than Ankole cattle, 23.4 +/- 10.4 and 28.4 +/- 9.6 months respectively (p < 0.05; t = 1.944; df = 121). Cows in poor BCS (< 2.5) are 1.67 times as likely to be in anoestrus as those with higher BCS (> or = 2.5) (chi2 = 9.476; df = 2; p < 0.01). Increased weaning age resulted in increased calving index (p < 0.001; t = -3.60; df = 38). Reproductive performance of Rwandan cattle is poor. Many of the problems can be attributed to husbandry practices and lack of experience and training in raising cattle.

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Puberty in South American Bos indicus (Zebu) cattle

Cited by 108 publications

References 50 publications

Genetic parameters and genetic trends for age at first calving and calving interval in an Angus-Blanco Orejinegro-Zebu multibreed cattle population in Colombia

Genetic parameters and genetic trends for age at first calving and calving interval in an Angus-Blanco Orejinegro-Zebu multibreed cattle population in Colombia

Follicular Dynamics in Heifers during Pre‐pubertal and Pubertal Period Kept under Two Levels of Dietary Energy Intake

Factors effecting reproductive performance in Rwandan cattle

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