The effects of dietary protein on age and weight at the onset of puberty in Brown Swiss and Zebu heifers in the tropics

Fajersson, Pernilla; Barradas, H.; Roman-Ponce, H.; Cook, R.M.

doi:10.1016/0093-691x(91)90425-d

Cited by 24 publications

(12 citation statements)

References 20 publications

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“…Some studies have shown that increasing the amount of dietary CP in B. indicus accelerates the onset of puberty (Fajersson et al 1991). Oyedipe et al (1982) reduced the time to the onset of puberty from 23 months with 8.3% CP to 18 months with 19.1% CP.…”

Section: Resultsmentioning

confidence: 98%

Effect of protein supplementation on reproductive and productive performance in Bos indicus × Bos taurus heifers raised in the humid tropics of Costa Rica

Maquivar

Galina

Galindo

et al. 2009

Trop Anim Health Prod

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In order to evaluate the effect of protein supplementation on the productive and reproductive performance of heifers, 45 Bos indicus x Bos taurus heifers, 673 +/- 146 days of age and weighing about 340 kg, were divided into two groups. The control group (n = 23) continued without supplementation, but the supplemented group (SG; n = 22) received concentrate at a rate of 1% BW kg per day. Animals were adapted to the concentrate over a 15-day period and then supplemented for 30 days, after which estrus was synchronized using a progesterone implant. Back fat thickness (BFT) was assessed by ultrasound. The SG had better average daily weight gain than the nonsupplemented group (0.63 +/- 0.16 vs. 0.51 +/- 0.13 kg/day, P < 0.05) and tended to show a better percentage ovulation (P < 0.10, 77% vs. 57%, respectively). However, this tendency was not reflected in the final pregnancy rates. No differences were observed between groups in dry matter intake and body condition scores. SG with a high BFT (>0.70 cm) showed a better ovulation percentage than those with low BFT (<0.69 cm; P < 0.01). Additionally, the pregnancy rate of supplemented heifers with high BFT tended to be better than heifers with low BFT in this same group (67% vs. 30%, respectively, P < 0.10). It is concluded that protein supplementation improved reproductive performance and that ultrasonography to measure BFT may be used to estimate reproductive performance.

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Section: Resultsmentioning

confidence: 98%

Effect of protein supplementation on reproductive and productive performance in Bos indicus × Bos taurus heifers raised in the humid tropics of Costa Rica

Maquivar

Galina

Galindo

et al. 2009

Trop Anim Health Prod

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“…In contrast, during the wet season, the availability of fodder to the heifer still in the process of growing tends to minimize the metabolic status of the animal Rhodes et al, 1995). In spite that most of the females responded to treatment forming CL's one cannot rule out the possibility (Fajersson et al, 1991) that although heifers have reached puberty defined as the presence of a CL, there might be a possible interaction between age and adult weight involved in the maturation of follicles or the formation of CL's that do not support a viable embryo.…”

Section: Discussionmentioning

confidence: 92%

Potential for Producing Viable Embryos in Post Pubertal Heifers. Comparison during the Dry and Wet Seasons in the Tropics Using a Protocol Based on FSH or eCG

Paez¹,

Basurto²,

Cohen³

et al. 2015

JAS

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The use of pubertal heifers to produce embryos before their natural breeding period which is normally at 3 years is a possibility that needs to be researched thus the objective of this assay was to superovulate pubertal Bos indicus heifers to obtain embryos in the dry and wet season, two phases were fodder availability is quite distinct.Twenty Brahman heifers 18 to 24 months and weighing 300 to 330 kg were synchronized with a progesterone releasing device (CIDR, Pfizer, Mexico) for 9 days and concomitantly applying a superovulatory regimen, using a total of 280 mg of FSH (Folltropin-V Bioniche Mexico) in eight applications with decreasing dosages 12 h apart, starting with two dosages of 50 mg followed by another two of 40, two of 30, and ending with two of 20 mg.One day before the device was withdrawn; an injection of 25 mg of prostaglandin F2α (Dinoprost Pfizer, México) was administered. For treatment with eCG an injection of 2000 I.U. of Equine Chorionic Gonadotropin eCG (Folligon, Intervet México) was administrated at day 6 after CIDR insertion. There were differences in the total follicular response between the dry season average n = 84 and the wet, average n = 51 (p < 0.05) but not between treatments. The number of good quality embryos recovered in either season was not more than 4. Response in relation to number of corpus luteum (CL) present and number of embryos was affected by season (p < 0.05) regardless of the treatment utilized.The production of embryos in post pubertal heifers is not feasible based in our results. Heat stress, nutritional inconsistencies, season when treatment applied and age might be some of the main driving factors for this poor response.

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“…These results confirmed that protein levels in growing animals can speed up certain physiological processes such as the onset of puberty. Subsequently, Fajersson et al (1991) supplemented heifers in the humid tropics of Mexico (12 B. taurus and 12 Bos indicus) with two different levels of protein (12.8% and 16.4%) and ad libitum diet from weaning at 3 months until the onset of puberty. Their results suggested that there was a significant effect of breed on age at the onset of puberty (9.4 months for the B. taurus heifers and 12.3 months for Zebu heifers).…”

Section: Preparation Of Heifers For Breedingmentioning

confidence: 99%

Factors Affecting the Readiness and Preparation of Replacement Heifers in Tropical Breeding Environments

Maquivar

Galina

2009

Reproduction in Domestic Animals

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The future of beef cattle production in tropical regions is uncertain because of land tenure concerns, threatening the survival of extensive management programmes in these areas of the world. The need to intensify production systems will inevitably lead to changes in the management of replacement animals in existing herds. The present review underlines the main constraints, which in the past could be resolved by the sheer numbers of animals present in beef cattle operations, with replacements reliant only on finding enough heifers to substitute the adult females destined for culling. This scenario is rapidly changing as beef cattle units in tropical regions subdivide to share out the land between as many farmers as possible. Consequently, issues such as the efforts needed to manage the pregnant cow, particularly her nutritional status and its effect on the new-born calf, the future replacement heifer growing in the presence of the dam, weaning management and procedures required before a heifer can be introduced into a breeding programme, need to be adequately and efficiently addressed by farmers in tropical regions.

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The effects of dietary protein on age and weight at the onset of puberty in Brown Swiss and Zebu heifers in the tropics

Cited by 24 publications

References 20 publications

Effect of protein supplementation on reproductive and productive performance in Bos indicus × Bos taurus heifers raised in the humid tropics of Costa Rica

Effect of protein supplementation on reproductive and productive performance in Bos indicus × Bos taurus heifers raised in the humid tropics of Costa Rica

Potential for Producing Viable Embryos in Post Pubertal Heifers. Comparison during the Dry and Wet Seasons in the Tropics Using a Protocol Based on FSH or eCG

Factors Affecting the Readiness and Preparation of Replacement Heifers in Tropical Breeding Environments

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