Biostimulatory effects of estrous cows and bulls on resumption of ovarian activity in postpartum anestrous Zebu () cows in the humid tropics

Bolaños, J. M.; Forsberg, M.; Kindahl, H; Rodriguez‐Martinez, Heriberto

doi:10.1016/s0093-691x(98)00013-2

Cited by 9 publications

(8 citation statements)

References 24 publications

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“…This is in agreement with earlier findings (Bolanos et al, 1998) and indicates the importance of good nutritional management of pregnant cows to cover the negative energy balance due to growth of the fetus and subsequent milk production (Claycomb et al, 1996). A positive effect of a high nutrition plan with restricted suckling on reducing the calving to conception interval was described by Das and colleagues (1999).…”

Section: Discussionsupporting

confidence: 91%

Radioimmunoassay of milk progesterone as a tool for fertility control in smallholder dairy farms

Shamsuddin

Bhuiyan

Chanda

et al. 2006

Trop Anim Health Prod

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This study focused on the use of radioimmunoassay of progesterone in milk for the diagnosis of post-partum ovarian cyclicity and accurate detection of oestrus and non-pregnancy in cows in the artificial insemination (AI) programme in Bangladesh. In Investigation 1, milk samples were collected on day 0 (day of AI), day 9-13 and day 21-24 from 444 milking cows of various breeds presented for the first postpartum insemination by 413 farmers living at 182 villages/regions in Mymensingh District from 6 AI centres and sub-centres. Each cow was then examined three times after each AI until it stopped returning to oestrus. Sixty to 90 days after the last AI, the cows were examined per rectum to confirm the pregnancy. Milk progesterone data on day 21-24 contributed to a clear diagnosis with respect to non-pregnancy in 100% cows, indicating a possible use of this progesterone assay for identifying non-pregnant cows in AI programmes. In Investigation 2, milk progesterone was monitored two times in a month with a 10-day interval in 88 cows. The samples were taken between 10 days after calving and the first detected oestrus, followed by two more samples 10 days apart. The proportion of cows accurately detected in oestrus was 30%. Another 30% were stated to be in oestrus when they were not (false positive) and 40% were not detected when they were in oestrus (false negative). The mean intervals between calving and oestrus and between calving luteal activity were 40 to 362 days (median=120, n=82) and 34 to 398 (median=111, n=64) days, respectively. The body condition scores at calving and at the initiation of luteal activity influenced the interval between calving and luteal activity (p < 0.05). Cows suckled twice daily initiated luteal activity earlier than their counterparts suckled several times daily (p < 0.05). Determination of progesterone in milk on day 21-24 is a good means for detecting non-pregnant cows.

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Section: Discussionsupporting

confidence: 91%

Radioimmunoassay of milk progesterone as a tool for fertility control in smallholder dairy farms

Shamsuddin

Bhuiyan

Chanda

et al. 2006

Trop Anim Health Prod

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“…The term ‘male effect’ or biostimulation has been used to describe the stimulatory effect of a male on oestrus and ovulation through sensorial cues and pheromone signalling (Chenoweth 1983). Such stimulatory effect is well documented in several domestic animals including cattle (Bolaños et al. 1998; Rekwot et al.…”

Section: Introductionmentioning

confidence: 92%

Effect of Acute Bull Exposure Around the Time of Artificial Insemination on Serum Oxytocin and Progesterone Concentrations and Pregnancy Rates in Dairy Cows

Ababneh

Obeidat

Husein

et al. 2012

Reprod Domestic Animals

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This study examined the effect of acute bull exposure around the time of artificial insemination (AI) on oxytocin and progesterone concentrations, and pregnancy rates in dairy cows. Ninety six dairy cows, stratified according to parity into primiparous and pluriparous, were divided into three groups; short bull exposure (SBE; 10 min, n = 32), long bull exposure (LBE; 4 h, n = 32) or no bull exposure (NBE; n = 32). On day 45 post-partum, all cows were treated with PGF2α on three occasions 11-14 days apart to synchronize oestrus. They were submitted to fixed time AI 80 h after the third PGF2α injection. Cows in the SBE and LBE groups were artificially inseminated 5 min after the introduction of the bull. From a subset of cows (n = 6 per group; three primiparous and three pluriparous), blood samples were collected once every 5 min starting 15 min before AI until 15 min after AI and analysed for oxytocin concentrations. Additional blood samples were collected for measurements of progesterone (P4) concentrations once daily for 4 days starting on the day of AI and once every 3 days thereafter until day 22. The effects of bull exposure, time, parity, difficulty of AI, and pregnancy on oxytocin and P4 concentrations were analysed using the mixed linear model procedure. Mean oxytocin concentrations or change in oxytocin concentrations after bull exposure or AI were not different among groups. Pregnancy rates for the NBE, SBE and LBE groups were 55.5%, 33.3% and 44.4%, respectively, and were not different among groups. In conclusion, acute bull exposure around the time of AI did not affect oxytocin and progesterone concentrations and did not improve pregnancy rates in dairy cattle under these farms conditions.

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“…Nutritional factors may also exacerbate or inhibit the incidence of oestrous behaviours in cows (Bolanos et al 1998;Orihuela 2000).…”

Section: Effect Of Nutritionmentioning

confidence: 99%

“…Nutrition can influence gonadotropin-releasing hormone (GnRH) secretion and the frequency of the LH pulse (Bolanos et al 1998) by stimulating the release of LH from pituitary cells (Naor & Catt 1981). Nutrition affects FSH and LH pulse frequency through short term modulation of ovarian function (Martin et al 1992a).…”

Section: Effect Of Nutritionmentioning

confidence: 99%

“…Level of nutrition and BCS are key factors which influence onset of oestrus in cattle of all breeds (Jolly et al 1995;Bolanos et al 1998;Lamb 1999;Orihuela 2000;Isle et al 2007) and the effects are thought to be mediated by the protein hormones, leptin and IGF-1. In Chapter 4, IGF-1 increased in the predictable manner with a higher level of nutrition but with leptin there were no such changes in Bali cattle.…”

Section: Reproductive Parametersmentioning

confidence: 99%

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Post-partum Anoestrus in Bali cattle under low-input animal production systems in Eastern Indonesia

Mumu¹

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Bali cows (Bos javanicus) are a common breed in Indonesia and are favoured by smallholders for their size and ease of husbandry. However reproduction rates can be low in some areas and poor nutritional and reproductive management including poor mating management, low availability of genetically superior bulls, poor oestrous detection, poor Artificial Insemination (AI) procedures and poor availability of inseminators at the proper time are crucial issues which are likely to affect this. This thesis examined factors affecting post-partum anoestrus (PPA) and inter-calving interval (ICI) in Bali cows and heifers. This was examined by using large data sets to identify the factors which affect pregnancy rates in villages, developing methods to detect oestrus and pregnancy in villages, examining the effect of body condition score (BCS) on hormonal patterns and by quantifying milk production in cows.A large scale analysis of records from across the eastern islands of Indonesia indicated that there was a median inter-calving interval of 380 days but that postpartum anoestrus could not be determined precisely because of poor observations of first return to oestrus and mating. These records used observational data over 2-4 years where cows under various village management procedures were observed for weight, BCS and at least dates of calving from which various reproductive parameters could be calculated. ICI proved to be most useful and accurate given the quality of observed data. The range in ICI was very large and low annual calving % were recorded. There was an association of high reproduction rate with body condition score (BCS) at calving such that a BCS >3.5 (out of 5) was associated with intercalving intervals of approximately 380 days. The median ICI across all sites was 380 days but some sites recorded 75 percentile values in excess of 500 days.In controlled pen experiments, faecal progestogens and vaginal electrical conductivity were examined as techniques to detect oestrus and pregnancy in the field. Faecal progestogens could be used successfully but there were problems with vaginal electrical conductivity in routine application and this requires more work. Cycling heifers were observed over complete cycles and plasma progesterone and faecal progestogens examined every 2 days. The pattern of faecal progestogen iii concentration over an oestrous cycle mirrored that of plasma progesterone and hence could be used to monitor the oestrous cycle and pregnancy but the sensitivity was low and a number of samples would need to be taken to detect the cycling pattern and/or pregnancy. Similarly cows were monitored over the oestrous cycle and vaginal electrical conductivity measurements made but the association was not strong or sensitive enough to be used routinely. Associations between plasma leptin or plasma IGF-1 concentration and BCS were examined in another controlled pen experiment and plasma IGF-1 concentration was increased in response to higher BCS but plasma leptin concentration was not affected. Heifers ...

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Biostimulatory effects of estrous cows and bulls on resumption of ovarian activity in postpartum anestrous Zebu () cows in the humid tropics

Cited by 9 publications

References 24 publications

Radioimmunoassay of milk progesterone as a tool for fertility control in smallholder dairy farms

Radioimmunoassay of milk progesterone as a tool for fertility control in smallholder dairy farms

Effect of Acute Bull Exposure Around the Time of Artificial Insemination on Serum Oxytocin and Progesterone Concentrations and Pregnancy Rates in Dairy Cows

Post-partum Anoestrus in Bali cattle under low-input animal production systems in Eastern Indonesia

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