Post parturient neonatal behaviour and their relationship with maternal behaviour score, parity and sex in Surti buffaloes

ABSTRACT Present study was conducted to investigate the post parturient behavioural activities of Surti buffaloes (n = 25) and their calves using low light-intensity cameras and digital video recorder at five stages (I: from calving to half an hour, II: 6–6:30 hours, III: 12–12:30 hours, IV: 18–18:30 hours and V: 24–24:30 hours after calving) over a period of 24 h immediately after calving. Based on their maternal behaviour score (MBS) dams were categorized into two classes that is, group 1 (MBS = 1: very aggressive and 2: very attentive) and group 2 (MBS = 3: indifferent and 4: apathetic) where dam scored MBS 1 represented very aggressive and 4 apathetic. Overall eating time was significantly (P < .05) higher in buffalo cows of group 2 (8.87 ± 1.34 min) than in group 1 (5.37 ± 0.50 min). Dams of both the groups spent significantly (P < .05) longer time in sniffing and licking calf’s body and licking ano-genital area of calf during stage I than later stages. Significantly (P < .05) longer time intervals from birth to standing (53.03 ± 3.04 min) were observed in group 2 calves. A positive correlation (P < .01) was observed between the time interval from birth to suckling and duration of active teat seeking (0.525). It may be inferred that post parturient neonatal behaviour have certain level of relationship with maternal behaviour score, whereas, parity and sex did not show any significant effect on MBS in Surti buffaloes.


Introduction
The behavioural events between mother and calf during early post-partum period have an important bearing on the survival of neonate and hence on the productive and reproductive performances of buffalo cows. In buffaloes immediately after calving there is a critical period (Gordon 1996) where mother-offspring bond establishes through fast learning (imprinting) using specific cognitive skills. In imprinting there is a rapid formation of permanent close attachment between an animal (calf) and salient environmental object (dam). During this period buffalo cows remain standing for longer duration to make close contact with their young ones in order to recognize (Usmani et al. 1990) and nurse them properly. Several studies had shown that cows spent maximum time in care giving behaviours like licking (Illmann & Spinka 1993;Val-Laillet et al. 2004) whereas, least priority have been given to maintenance behavioural activities viz. eating (Huzzey et al. 2005) and rumination (Pahl et al. 2014) during early post-partum period. To ensure strong mother-offspring bonding and good expression of maternal behaviours (licking, nursing and protection) longer periods of dam-calf contact may be recommended under extensive and organic dairy farming (Grandinson 2005).Since little is known on cow-calf relationship in buffaloes, the current study has been designed to investigate the post parturient neonatal behaviour and its relationship with maternal behaviour score, parity and sex in Surti buffaloes.

Study area
The present study was conducted on Surti buffaloes maintained at Livestock Research Station of Navsari Agricultural University, Navsari, Gujarat, India between November 2012 and March 2013. The study place is located at 20°15 ′ to 21°23 ′ N latitude and 70°38 ′ to 74°23 ′ E longitude at an elevation of 800 m above the mean sea level. The climate of the region is sub-humid tropical with heavy rainfall. Generally, winter (November-February) remains fairly cold and dry, summer (March-June) is moderately hot and humid while monsoon (July-September) is hot and extremely humid.

Experimental design and animals
Initially we selected 30 animals for the study however due to below average birth weight of calf, delayed let down of milk in dam we excluded the data of 5 animals and finally a total of 25 Surti buffaloes, 8 primiparous and 17 multiparous (2-9 parity) were categorized into two classes viz. groups 1 and 2 based on the maternal behaviour score (MBS). To study the maternal behaviour score in Surti buffaloes a method proposed by Sandelin et al. (2005) was utilized. In this method, dams were classified from 1 to 4 score where score 1: very aggressive; cow was willing and did fight the handler to protect calf, score 2: very attentive; cow remained in close proximity with mild aggression, but did not fight the handler to protect calf, score 3: indifferent; cow remained in proximity, showed no aggression toward handler, but remained in sight of calf and score 4: apathetic; cow showed no emotion toward calf in presence of handler, grazed away or moved out of proximity. However, considering the number of animals in each maternal behaviour score, dams with score 1 and 2 were categorized as group 1 whereas, scores 3 and 4 as group 2.

Management of experimental animals
The experimental buffaloes were housed in individual calving pens before one week of expected date of calving. The calving pens have both covered and open space as per Bureau of Indian Standards specifications. The open paddock was surrounded by 1.5 m high brick wall with two metallic door lock gates on each side. All the animals were fed as per farm routine practices whereas; fresh and clean drinking water was accessed freely round the clock.

Behavioural recording
For observing the post parturient behaviours of dam and calf, video recording was done with a low light-intensity camera and a time-lapse digital video recorder (Gobbler H.264 Network DVR). Four cameras were fit in the calving pen (two dome type and two bullet type) and one camera was also placed in open paddock. To facilitate behavioural data recording at night the calving pens were illuminated with 40 W compact fluorescent lamp. The intensity of lights was sufficient to note down all the behavioural activities. As the animals were accustomed to the similar light during the night at the farm, such illumination during the experiment was not likely to influence the behaviour of the animals. To extract all the data on behaviour from DVR, a specialized coding sheet for each parameter was used.
The post parturient behavioural activities of dams and their calves were observed immediately after calving till 24 h postpartum. The 24 h post-partum period was divided into 4 intervals of 6 h each and during every interval individual buffalo was observed for 30 min. During these intervals the postural states and maternal behavioural activities like lying, eating, rumination, self-licking, sniffing and licking the calf's body and licking the ano-genital area of the calf were recorded for each dam. The time at which these observations were recorded has been shown below as stages: During post-partum period the calves (13 male and 12 female) were observed for both postural states and the elapsed times between birth and the behavioural activities viz. lifting of the head, fore leg and hind leg, standing time, suckling and teat finding. Further, duration between udder to teat finding, teat finding to suckling and duration of active teat seeking along with number of suckling and standing attempts were also observed.

Statistical analysis
The frequency of each behaviour activity as well as percentage of animal showing these activities at different time intervals were recorded. For each group (N = 2) the same behavioural traits were recorded repeatedly at different point of time (N = 5). The PROC GLM procedure was used for repeated measure analysis of variance using SAS 9.3. The Duncan Multiple Range Test was used for mean separation within and between groups over different time periods. The PROC CORR procedure was used for estimation of correlation coefficient among analysis variables.

Post parturient maternal behaviour
The various post parturient behavioural activities of buffalo dams were observed at five different stages ( Table 1). Perusal of data revealed that the time spent in lying by cows of group 2 was significantly higher during IV and V stages than stage II. Overall eating time was significantly (P < .05) higher in buffalo cows of group 2 than in group 1. During stage I, the extent of self-licking behaviour was significantly (P < .05) higher in group 1 which diminished with the progression of post calving period. However, dams of both the groups spent significantly (P < .05) longer time in sniffing and licking calf's body and licking ano-genital area of calf during stage I than later stages.

Effect of maternal behaviour score (MBS) on neonatal behaviour
There was non-significant effect of parity and sex of calf on MBS.
The MBS for primiparous and pluriparous buffaloes were 2.75 ± 0.37 and 2.06 ± 0.18, respectively. The MBS of dams of male and female calves were 2.23 ± 0.201 and 2.33 ± 0.310, respectively. The time interval between birth to post parturient neonatal behavioural activities viz. head lifting, teat finding, duration of active teat seeking and number of standing attempts were higher in group 1 calves as compared to group 2 calves. However, the duration from birth to fore leg, hind leg lifting, standing and suckling were higher in group 2 calves than group 1 calves (Table 2). Further, the time interval between udder to teat finding, teat finding to suckling and number of suckling attempts were also higher in group 2 calves than the group 1 calves. The perusal of Table 2 had also indicated that MBS was significantly (P < .05) higher in buffalo dams in group 2 than in group 1. Significant (P < .05) increase in time intervals from birth to hind leg lifting and standing were observed in group 2 calves than those in group 1.

Relationship among neonatal behaviour, MBS, parity and sex
The correlation coefficients among MBS and various behavioural activities of calf have been depicted in Table 3. Moderate, positive and significant (P < .05) correlation was found between maternal behaviour score and suckling attempts, time interval between teat findings to suckling. However, a strong, positive and significant (P < .01) correlation has been observed between head lifting and lifting of fore leg and time taken in lifting fore limb to time taken in lifting hind limb and standing. Further, time interval between birth to suckling and time taken in birth to teat finding (0.894), udder to teat finding (0.602) and duration of active teat seeking (0.525) had shown a positive and significant (P < .01) correlation. However, a negative and significant (P < .01) correlation was observed between time interval between teat finding to suckling and duration of active teat seeking period.

Discussion
In the present study buffalo dams had shown mainly three types of behavioural activities viz. maintenance behaviour, care giving (epimeletic) behaviour and few abnormal behavioural activities. Most of the time buffalo dams showed the calf-related behaviour just after calving whereas, other behavioural activities were on the least priority. However, as time passed maintenance behavioural activities were increased. Parturition is the most painful process making dam more restless just before the calving. Therefore, majority of cows remain standing before parturition which might be due to discomfort (Huzzey et al. 2005). Further, cows have to make physical contact with their new born in order to identify and nurse them. Hence, most of the dams remain standing during earlier phase of post-partum period to ensure the proper suckling in the young ones (Selman et al. 1970) is in consonant to the present findings. Similarly, smaller lying episode during early post calving period in the present study is supported by Jensen (2012). In buffalo dams recognition of calf is established immediately after calving termed as critical period (Gordon 1996). During critical period there is a rapid formation of permanent close attachment between an animal and a relevant environmental object, like its mother through mother-offspring bond known as imprinting, a key determinant for the survival of neonates in farm animals. In this period mother quickly learns to identify her own calf (Weary & Chua 2000) through the process of maternal grooming and licking (Fraser & Broom 1990) resulting a reciprocal recognition between buffalo dams and their own calves (Usmani et al. 1990). The present study reported least eating period in first stage which is in consonance with results observed by Huzzey et al. (2005). Immediately after calving during critical period buffalo dam showed least eating time which might be attributed to the fact that buffalo cow spent maximum time in close attachment with their neonate to detect her own calf (Weary & Chua 2000) for better survival. Further, lower eating period in dams with low MBS might be due to more number of primiparous animals experienced more parturition stress. Results of this study indicated shortest rumination period during the early post calving stage which is supported by Soriani et al. (2012)  Buffalo dams spent higher time in sniffing and licking calf's body during early post-partum period which declined subsequently. Our findings are in accordance with Illmann and Spinka (1993) in cows and Val-Laillet et al. (2004) in ewes. Buffalo dams stand up immediately after calving and start licking the calf vigorously to stimulate the calf activity, respiratory centre, breathing (Hafez 1992), circulation, urination and defaecation (Metz & Metz 1986). Further, licking of calf after birth is also important for reinforcing the mother-calf bond (Fraser & Broom 1990) and drying the coat to prevent chill (Sato et al. 1991). More licking ano-genital area of calf during early phase of post calving period by dams in this study is in consonance with Houwing et al. (1990) who reported that cows spent 43% of time in licking her neonate during 3 h post-partum. Further, greater extent of licking ano-genital area of calf in dams of group 2 than in 1 may be because of high maternal care as result of high MBS. More maternal licking confined to the perennial region (Qureshi et al. 2000) might be attributed to the fact that dam promoted the emptying of belly to improve nursing as it stimulates the standing, defaecation and urination in newly born calf.
The present findings showed that calves spent relatively longer time from birth to head lifting, teat finding, duration of active teat seeking and number of standing attempts in dams with lower MBS than higher one which might be attributed to the fact that dams of high maternity may help their young ones to lift their head and other exploratory behaviour immediately after calving. The findings of this study are in accordance with Hafez (1992) who observed that buffalo calves take at least 45 min to stand and may take upward of 4 h to suckle for the first time. However, higher time intervals from birth to hind leg lifting, standing and suckling were found in calves of group 2 indicated that dams with high MBS might be engaged with their calves for longer duration. We observed higher time period between udder to teat finding, teat finding to suckling and number of suckling attempts in calves  (Lidfors et al. 1994;Paranhos Da Costa et al. 1994).
The results of this study showed a strong, positive and significant (P < .01) correlation between head lifting and lifting of fore leg and time taken in lifting fore limb to time taken in lifting hind limb and standing which may be because all these events occur in sequence, first calf lifts its head then tries lift fore leg followed by lifting of hind leg then finally tries to stand hence there is relationship between these events. Further, relationship between these two aspects can be attributed to the fact that calf vigour and degree of maternal care both influence neonatal behaviour. We observed a positive and significant (P < .01) correlation between time interval birth to suckling and time taken in birth to teat finding, udder to teat finding and duration of active teat seeking which might be due to the fact that after birth calf tries to locate the udder and teats by trial and error method hence these events are interrelated. Furthermore, a negative and significant (P < .01) correlation was found between time interval between teat finding to suckling and duration of active teat seeking period which might be attributed to the fact that when calf takes more time to suck after locating the teats the duration of active teat period is supposed to be prolonged.

Conclusion
The findings of present investigation revealed that post parturient neonatal behaviour have certain level of correlation with MBS. However, parity and sex did not show any significant relationship with calf behaviour in Surti buffaloes. Further, the lack of effect of parity may also be due to reduced number of animals and a large group size may alter these results. Hence, a keen knowledge of mother-offspring interaction immediately after calving may help to evolve good management practices during early post-partum period. Further, there is need of indepth studies regarding offspring protection behaviour in the context of quality of human-animal relationship and relationship between offspring protection and maternal care.

Disclosure statement
No potential conflict of interest was reported by the authors.