Influence of seasonal changes on physiological variables, haematology and serum thyroid hormones profile in male Red Sokoto and Sahel goats

Habibu, B.; Kawu, M.U.; Aluwong, Tagang; Makun, H.J.

doi:10.1080/09712119.2016.1220384

Cited by 30 publications

(29 citation statements)

References 36 publications

(47 reference statements)

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“…Severe dehydration has been reported in livestock exposed to thermal stress, which ultimately led to an increase in PCV, RBC and Hb (McManus et al, 2009;Sejian et al, 2014;Habibu et al, 2017). Thus, heat stress during the HDS was likely responsible for the high PCV and RBC observed in the current study, apparently due to increased thermoregulatory loss of body fluids.…”

Section: Discussionmentioning

confidence: 43%

“…1; Nicholson, 1995). Although a previous study reported higher erythrocyte membrane integrity in Sahel than Red Sokoto kids during the HDS (Habibu et al, 2016a), the higher relative humidity in the Guinea savanna of Nigeria may be a negative factor influencing thermoregulation of Sahel kids in the geographical area and may be responsible for the changes observed in erythrocytic parameters observed during the HDS (Habibu et al, 2017).…”

Section: Discussionmentioning

confidence: 80%

“…The higher magnitude of the increase in PCV and RBC in Sahel compared with Red Sokoto kids during the HDS may imply higher thermoregulatory fluid loss in Sahel kids, probably due to higher respiratory rate (Habibu et al, 2016b). This difference in breed response may be due to variation in thermoregulatory plasma fluid dynamics, as higher plasma volume, indicated by decrease in RBC and Hb has been reported in adult bucks of Red Sokoto, while an increase in PCV and RBC was observed in Sahel goats during the HDS when compared with CDS and RAS (Habibu et al, 2017). The ability of Red Sokoto goats to maintain relatively higher plasma volume, despite the expected thermoregulatory fluid loss during heat stress, indicates a higher level of adaptation to the tropical savanna and may, at least in part, explain why they naturally survive in diverse geographic locations (Sudan and Guinea savannas) and are the predominant breed of goats in Nigeria.…”

Section: Discussionmentioning

confidence: 91%

“…However, the finding disagreed with that of Abdelatif et al (2009), who reported higher MCV values in Nubian goats of Sudan during summer than in winter. The decrease in MCV (average size of the erythrocytes) during the HDS may be due to an increase in the number of erythrocyte membrane vesicles formed and shed from the erythrocytes as a result of elevation in body temperature, with a resultant decrease in the size of the parent erythrocytes (Foller et al, 2010;Moore et al, 2013;Habibu et al, 2017). Thus, it is logical to infer that a decrease in MCV may have the potential of being used as an indicator of heat stress in tropical goats naturally exposed to heat stress.…”

Section: Discussionmentioning

confidence: 99%

“…Due to the economic importance of goats, a lot of information is available on their haematology (Tibbo et al, 2004;Zumbo et al, 2011;. Breed, sex, age and season may greatly influence haematological profile of goats, with season classically increasing or decreasing haematological variables (EgbeNwiyi et al, 2000;Tibbo et al, 2004;Zumbo et al, 2011;Habibu et al, 2017). However, there is a paucity of information on the haematological responses of different breeds, sexes and age groups of goat kids in different seasons of the tropics.…”

Section: Introductionmentioning

confidence: 99%

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Influences of breed, sex and age on seasonal changes in haematological variables of tropical goat kids

et al. 2017

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Abstract. The influences of breed, sex and age on seasonal changes in haematological variables of kids (1-4 months old) belonging to Red Sokoto (n = 60) and Sahel (n = 60) goats were studied at the peaks of the cold-dry, hot-dry and rainy seasons in a West Africa Guinea savanna climate. The results showed that, during the hot-dry season, Sahel goat kids had significantly higher (P < 0.05) packed cell volume (PCV) and red blood cell (RBC) count but lower (P < 0.05) mean corpuscular volume (MCV), mean corpuscular haemoglobin (MCH), mean corpuscular haemoglobin concentration (MCHC) and total leucocyte count than Red Sokoto kids. Similarly, younger kids of both breed had significantly higher (P < 0.05) PCV and RBC but lower MCV, MCH and MCHC compared with the older kids during the hot-dry season. Younger kids (1-2 months) of both breeds exhibited significantly (P < 0.05) high PCV and RBC but low MCH and MCHC during the hot-dry season as compared with the cold-dry and rainy seasons, with the magnitude of the change being greater in Sahel kids. More remarkable seasonal fluctuations in haematological parameters were observed in buck kids than doe kids of both breeds. Multivariate analysis revealed a clear distinction between the change in haematological parameters during the cold-dry as compared with the hot-dry and rainy seasons, with MCV having the strongest discriminating power (0.91 * ). In conclusion, breed, age and sex variations in haematological variables of goats were more pronounced in the hot-dry season, during which the seasonal changes were more dramatic in kids of Sahel goats, as well as in younger and male kids of both breeds. These findings may be useful in the management of tropical goat kids in different seasons.

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Section: Discussionmentioning

confidence: 43%

Section: Discussionmentioning

confidence: 80%

Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influences of breed, sex and age on seasonal changes in haematological variables of tropical goat kids

et al. 2017

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Physiological, oxidative and metabolic responses of lactating water buffaloes to tropical climate of South China

Hassan

Tang

et al. 2021

Veterinary Medicine & Sci

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Background Heat stress in tropics is generally associated with significant economic losses resulting from reduced performance, morbidity, and mortality of livestock. To avoid serious consequences of heat stress, it is imperative to better understand the physiological responses and biochemical changes under the state of altered body homeostasis during different seasons of the year. Objectives This study aimed to evaluate the seasonal dynamics of physiological, oxidative and metabolic responses of lactating Nili‐Ravi buffaloes to the tropical climate of South China. Methods Physiological responses including rectal temperature (RT), body surface temperature (BST) and respiratory rate (RR) along with serum biochemical and antioxidant parameters of 20 lactating Nili‐Ravi buffaloes were evaluated during different seasons of the year. Results Higher temperature‐humidity Index (THI) during the summer season (>80) resulted in a significant increases in RR and BST as compared to the winter season. Higher oxidative stress was observed in the summer season as revealed by significantly higher MDA while lower serum antioxidant enzyme (TAC, GSH‐Px, SOD and CAT) contents. Moreover, serum cortisol was also significantly higher in summer and autumn. The levels of growth hormone and ACTH were also significantly (P < 0.05) lower in summer and autumn as compared to other seasons. The negative association of THI with physiological and antioxidant parameters was observed while it was positively associated with serum MDA and cortisol levels. Conclusions Our study revealed moderate heat stress in lactating buffaloes in the summer season which calls for attention to avoid economic losses and animal welfare issues.

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Hair coat characteristics and thermophysiological stress response of Nguni and Boran cows raised under hot environmental conditions

Katiyatiya

Muchenje

2017

Int J Biometeorol

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Breed, age, coat colour, month and temperature humidity index (THI) influence on body weight (W), body condition score (BCS), thermophysiological variables (rectal temperature (Tr), skin temperature (Tsk)) and hair length was studied in Nguni (n = 19) and Boran (n = 16). As a result of this study, breed influenced W, BCS and Tsk on the neck and belly (P < 0.05). The BCS and W of Nguni cows were higher than the Boran cows. Hair length of both breeds increased from February to August. The THI influenced thermophysiological variables (P < 0.05). Increased Tr for both breeds was recorded in February and April, respectively (P < 0.05). Month influenced Tsk and June recorded lower values (P < 0.05). Younger cows (3-8 years) had lower weight and high Tr and Tsk (P < 0.05). Nguni cows had high neck and thurl temperatures in June while Boran cows had the highest in August (P < 0.05). Red, dun and white-black Boran cows had increased BCS. Nguni cows with red, fawn and white cows had high BCS. Fawn-coloured Nguni cows and white-brown Boran cows had the more weight than cows with other colours compared in the study. White-red Nguni and Boran cows recorded the highest Tr. For Nguni cows, neck and belly temperatures were significantly (P < 0.001) correlated to thurl temperature. Boran cows had significant (P < 0.001) correlations for THI and neck, belly and thurl temperatures. The current study found that Nguni cows were more adapted to the prevailing bioclimatic changes. However, Boran cows have the potential of performing well under heat stress conditions over time.

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Influence of seasonal changes on physiological variables, haematology and serum thyroid hormones profile in male Red Sokoto and Sahel goats

Cited by 30 publications

References 36 publications

Influences of breed, sex and age on seasonal changes in haematological variables of tropical goat kids

Influences of breed, sex and age on seasonal changes in haematological variables of tropical goat kids

Physiological, oxidative and metabolic responses of lactating water buffaloes to tropical climate of South China

Hair coat characteristics and thermophysiological stress response of Nguni and Boran cows raised under hot environmental conditions

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