Seasonal Variation in Semen Quality of Some Missouri Dairy Bulls

Swanson, E.W.; Herman, Harry August

doi:10.3168/jds.s0022-0302(44)92600-7

Cited by 15 publications

(9 citation statements)

References 3 publications

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“…Further work demonstrating the effect of season and bull sperm quality has led to largely inconsistent conclusions. For example, whilst some have shown no seasonal effect on sperm motilty 13 – 17 , others have shown an increase during summer 18 , 19 or (in complete contrast) winter 20 – 22 . Similarly, results have been obtained with total sperm production and sperm morphology with some reports suggesting season has no effect 13 – 15 , 23 whilst others show an increase during summer 15 , 18 , 19 , 24 , or winter 13 , 16 , 17 , 23 .…”

Section: Introductionmentioning

confidence: 99%

Seasonal variation in bull semen quality demonstrates there are heat-sensitive and heat-tolerant bulls

Netherton

Robinson

Ogle

et al. 2022

Sci Rep

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Using semen data from 1271 ejaculates (79 different bulls, 11 different breeds) we have investigated the variability of semen quality in cattle living in sub-tropical conditions. Modelling shows definitive evidence of seasonal variation. Semen quality from the same bulls had a 90% “pass rate” for cryopreservation purposes in winter, dropping to less than 50% in summer. Notably, individual bulls could be classified as either “heat-tolerant” (produce good quality spermatozoa all year regardless of temperature) or “heat-sensitive” (only produce good quality sperm in summer). Nominal logistic regression demonstrated when temperatures reach 30.5 °C, 40% of heat-sensitive bulls fail a semen analysis 17 days later. At 34 °C, the proportion of bulls failing reached 63%. Ratifying this, the purposeful heating of bulls to 40 °C for 12 h showed that individual animals had different degrees of heat-sensitivity. Using historical temperature data, we then modelled how many days/decade bulls would be subject to heat-events. Beginning from 1939 to 1949, on average, the area in which bulls were kept recorded 19, 7 and 1 day over 38 °C, 39 °C and 40 °C respectively. This number steadily increases and of last decade (2010–2010), the numbers of days per decade over 38 °C, 39 °C and 40 °C jumped to a staggering 75, 39 and 15 respectively. These data show the urgent need to identify heat-tolerant bulls as future sires. Such variation likely explains why the veterinary bull breeding test often fails to accurately predict bull breeding potential.

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Section: Introductionmentioning

confidence: 99%

Seasonal variation in bull semen quality demonstrates there are heat-sensitive and heat-tolerant bulls

Netherton

Robinson

Ogle

et al. 2022

Sci Rep

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“…& Mackle (1967) and disagree with findings of other workers. Erb, Andrews & Hilton (1943), Swanson & Herman (1944), Hafs et al (1958) andTomar et al (1966 reported highly significant variation in initial motility from month to month and from season to season. While Sinha & Prasad (1966) found a significant effect of season on motility in Tharparkar bulls.…”

Section: Mass Activity and Individual Motilitymentioning

confidence: 95%

“…Tomar, Misra & Johari (1966) observed no significant effect of season on per ejaculate semen volume in Hariana and Murrah bulls. Swanson & Herman (1944), Hafs, Bratton, Henderson & Foote (1958 and Sinha & Prasad (1966), on the other hand, reported highly significant seasonal variation in volume of semen. Sayed, Oloufa & Badreldin 1960), Pavlicenko (1965), Hafez & Bonadonna (1958) and Varaksa (1967) reported that semen volume in cattle and buffaloes was highest during summer, while Sinha & Prasad (1966) observed highest and lowest semen volumes in Indian cattle during spring and autumn respectively.…”

Section: Volumementioning

confidence: 96%

Seasonal variation in semen characteristics of Friesian bulls in Iraq

Dessouky¹,

Juma²

1968

J. Agric. Sci.

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A total of 1659 ejaculates was collected from four Friesian bulls imported from Europe and ten of their offspring born in Iraq while in regular artificial service at the Abu-Ghraib Experiment Station. The work covered a period from 1 January 1965 to 30 June 1967.The five semen characteristics, volume, density, mass activity, individual motility and pH were studied and the influence of age of bull and season on these characters was investigated. The relationships between the characters were also investigated.Deterioration was observed in volume of ejaculate, density, mass activity and individual motility in the Iraqi Friesians. Influence of season on all semen characters lacked significance with the exception of mass motility in the European Friesian bulls (P < 0-05). Highly significant positive correlations were found between most of the characters studied.The aim of the present work was to study the volume, density, mass activity, individual motility and pH of the semen from imported Friesian bulls and pure Friesian bulls born in Iraq, with reference to the effect of age of bull and season on these characters. The relationships between the various semen characters were also investigated.

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“…Yet further work demonstrating the effect of season and bull sperm quality has led to largely inconsistent conclusions. For example, whilst some have shown no seasonal effect on sperm motilty, [17][18][19][20][21] , others have shown an increase during summer 22,23 or (in complete contrast) winter [24][25][26] . Similarly, results have been obtained with total sperm production and sperm morpholgy with some reports suggesting season has no effect 17,18 19,27 whilst others show an increase during summer 18,22,23,28 , or winter 17,20,21,27 .…”

Section: Introductionmentioning

confidence: 99%

“…For example, whilst some have shown no seasonal effect on sperm motilty, [17][18][19][20][21] , others have shown an increase during summer 22,23 or (in complete contrast) winter [24][25][26] . Similarly, results have been obtained with total sperm production and sperm morpholgy with some reports suggesting season has no effect 17,18 19,27 whilst others show an increase during summer 18,22,23,28 , or winter 17,20,21,27 . As such, opinions on whether seasonal alterations are indeed a source of variation in cattle semen quality are still divided.…”

Section: Introductionmentioning

confidence: 99%

The Seasonal Effect of Temperature On Bull Semen Quality: The Emergence of Heat-Sensitive And Heat-Tolerant Bulls

Netherton¹,

Gunn

Robinson³

et al. 2022

Preprint

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A key challenge for years to come is feeding a rapidly growing human population, whilst lowering the overall costs and impact on the environment. In addition, as global temperatures increase, natural resources must be utilised as a basic means to overcome climate-related issues. To this end, improvements to bull fertility are recognised as a major mechanism that address both the economical and environmental balance. Using semen data from 1271 ejaculates (79 different bull, 11 different breeds) we have investigated the variability of semen quality in cattle living in sub-tropical conditions. Modelling show definitive evidence of seasonal variation, with 90% cryopreservation pass rates winter, dropping to less than 50% in summer. Individual bulls could be classified as either “heat-tolerant” (produce good quality spermatozoa all year regardless of temperature) or “heat-sensitive”. Nominal logistic regression demonstrated when temperatures reach 30.5oC, 40% of heat-sensitive bulls fail a semen analysis 17 days later. At 34oC, the proportion of bulls failing will reach 63%. Ratifying this, the purposeful heating of bulls to 40oC for 12 hours experimental verified the dataset, demonstrating heat-tolerant and different degrees of heat-sensitive bulls exists. Notably, heat-tolerance and heat-sensitivity appear to be genetically inherited. Using historical temperature data, we then modelled how many days/decade bulls would be subject to heat-events. Beginning from 1939-1949, on average, the area in which bulls were kept recorded 19, 7 and 1 day over 38 oC, 39 oC and 40oC. This number steadily increases and of last decade (2010-2010), the numbers of days per decade over 38 oC, 39 oC and 40 oC jumped to a staggering 75, 39 and 15 respectively. These data show the urgent need to identify heat-tolerant bulls as future sires. Such genetic gain would decrease the generational interval, prevent unnecessary culling of cows and increase efficiency of livestock needed for world food programs.

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Seasonal Variation in Semen Quality of Some Missouri Dairy Bulls

Cited by 15 publications

References 3 publications

Seasonal variation in bull semen quality demonstrates there are heat-sensitive and heat-tolerant bulls

Seasonal variation in bull semen quality demonstrates there are heat-sensitive and heat-tolerant bulls

Seasonal variation in semen characteristics of Friesian bulls in Iraq

The Seasonal Effect of Temperature On Bull Semen Quality: The Emergence of Heat-Sensitive And Heat-Tolerant Bulls

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