Milk Production of Sarda Suckler Cows with Different Calving Period  

作　　者：Marco Acciaro Corrado Dimauro Valeria Giovanetti Giampaolo Epifani Carla Manca Salvatore Contini Andrea Cabiddu Mauro Decandia Giovanni Molle 

机构地区：[1]AGRIS Sardegna,Olmedo 07040,Italy [2]Dipartimento di Agraria,Universitàdi Sassari,VialeItalia 39,Sassari 07100,Italy

出　　处：《Journal of Agricultural Science and Technology(A)》2020年第2期86-97,共12页农业科学与技术（A）

基　　金：The excellent cooperation of Mr.Gianni Meloni,Stefano Picconi,Salvatore Pintus and Nino Lei as well as the staff of Foresta Burgos research farm and the laboratory staff of AGRIS is highly appreciated.

摘　　要：The study explored the relationship between the performance of calves and calving season in a Mediterranean rangeland-based beef livestock system.Twenty multiparous Sarda cows,grazing on a natural pasture,with two distinct calving periods(group A,11 animals,calving date 15/10/2016±16(means±s.d.),and group W,nine animals,calving date 26/01/2017±11)were used.Meteorological data,herbage quality,daily milk yield(DMY),total milk yield(TMY),body weight(BW)of cows and calf,body-weight daily gain(ADG)of calves,body condition score(BCS)and calving interval(CI)of cows were assessed.A mixed-effects model was used to DMY and ADG data while TMY,BCS,weaning weight(WW)and CI data were analyzed by a linear model.The most determining factors in the DMY and ADG were detected by means of partial least square regression(PLSR)procedure.Group W showed higher DMY(6.5±0.3 kg/d vs.4.5±0.3 kg/d,p<0.001)and TMY(1,189±70 kg vs.830±60 kg,p=0.002)than Group A,but this did not result in a greater ADG of calves(Group A:0.83±0.04 kg/d/animal and Group W:0.99±0.09 kg/d/animal,p-value not significant)or WW when adjusted for their age(Group A:216±14 kg/animal and Group W:250±22 kg/animal,p-value not significant).In contrast,the WW actually measured were higher in Group A than in Group W(257±7 kg vs.175±8 kg,p<0.001).The Group W cows experienced a minor CI than Group A cows(288±13 d vs.320±8 d,p=0.04).The results of PLSR suggest that the factors with utmost importance for both DMY and ADG were the age and the body-weight of cows,highlighting the excellent maternal ability of Sarda breed and its good adaptation to environment.

关 键 词：Sarda cow suckler-cow system weigh-suckle-weigh method partial least square regression 

分 类 号：S82[农业科学—畜牧学]