Inaugural ASAS–CAAV Asia Pacif ic Rim Conference Abstracts

42 Efficiency of methods applied for goat estrous synchronizationin subtropical climate zone. Y. Zhao* 1 , J. Zhang 1 , H. Wei 2 , X. Sun 3 , M. Yu 1 ,L. Wang 1 , B. Mu 1 , and C. Zhao 1 , 1 College of Animal Science and Technology,Chongqing Key Laboratory of Forage and Herbivore, Southwest University,Beibei, Chongqing, China, 2 Faculty of Laboratory Animals, Third MilitaryMedicine University, Shapingba, Chongqing, China, 3 Department of Anatomy,Medical College, Jinggangshan University, Jinggangshan, Jiangxi, China.The aim of this study was to select one efficient procedure used for estroussynchronization in indigenous Chinese goats and then to evaluate its potentialwhen applied in goat production in a subtropical climate zone. In a randomizedblock design, a total of 80 indigenous does were divided into 4 groups and thedoes in group A were treated estrous synchronization by intravaginal spongesimpregnated with 30 mg of levonorgestrel inserted for 10 d. Does in groups B, C,and D were treated with a further injection of 25 IU of FSH, 0.05 mg of PGF 2α,and 25 IU of FSH + 0.05 mg of PGF 2αat sponge withdrawal, respectively.The efficiency of estrus synchronization and reproductive performancewas evaluated. A total of 140 does on 5 goat farms in the breeding and thenonbreeding season in different counties of southwestern China were treatedwith the selective procedure. Results revealed that all the treatments used werecapable of inducing and synchronizing estrus in goats. The use of intravaginalsponges impregnated with 30 mg of levonorgestrel and 0.05 mg PGF 2αis thefirst choice for estrous synchronization in indigenous goats in southwesternChina. Ninety-five percent of treated does in group C demonstrated estrus. Thiswas significantly higher than in group A (P < 0.05). There was a significantdelay in the onset of estrus (51.79 ± 6.99 h). The time to onset of estrus in thetreatment with FSH (groups B and D) was significantly shorter (P < 0.01). Thepercentage of goats ovulating and the ovulation rates among different groupswere not significant (P > 0.05). When the selective procedure was applied on5 goat farms, 85.71% (120/140) of the does demonstrated estrus. The averagekidding percentage and litter size were 62.50% and 1.77, respectively. The doesin Dujiangyan, which were group-housed and had estrus induced in the breedingseason, showed the greatest estrous response (94.29%), kidding percentage(81.82%), and litter size (1.96 ± 0.44). Results indicated that the treatment usedwas capable of inducing and synchronizing estrus in goats in this area.Key Words: goat, estrous synchronization, nonbreeding seasonSYMPOSIA AND ORAL SESSIONSSmall Ruminant, Forages and Pasturesmean was lower for KK kids (789 eggs/g) than for BK and KB kids (1,511,1,557 eggs/g). In conclusion, breed can significantly affect the postweaningperformance of meat goat kids on pasture.Key Words: meat goat, breed, growth44 Effects of Chinese herbal medicine compoundsupplementation to the basal diet on the main protein digestive enzymes ingrowing beef cattle. H. F. Wang 1 , W. R. Yang* 1 , Z. B. Yang 1 , Y. H. Cui 1 , andY. Wang 2 , 1 Shandong Agricultural University, Tai-an, Shandong, P. R. China,2Agriculture and Agri-Food Canada, Lethbridge Research Centre, Lethbridge,Canada.An experiment was conducted to evaluate the effects of 3 kinds of Chineseherbal medicine compounds (CHMC) on the activity of the main proteindigestive enzymes in growing beef cattle. A total of 32 crossbred beef cattle(Limousin × Lu-xi, 199.37 ± 8.67 kg) were randomly divided into 4 treatments.The control group was fed a basal diet (no herbs added) and 3 tested groupswere fed the basal diet supplemented with 3 kinds of CHMC, respectively,A, B, and C. The addition level of herbals was 2% of concentrate feed. Thewhole experiment was divided into 2 stages: a preliminary test period (10 d)and a test period (90 d). All the data were analyzed using the GLM procedure ofSAS. Adding CHMC improved the activity of pepsin significantly (P < 0.05).There was no significant variation in activity of trypsin in the duodenum intest groups (P > 0.05). However, CHMC improved the activity of trypsin inthe jejunum and ileum significantly compared with the control group. In thejejunum, prescriptions A and C played the better role than prescription B (P< 0.05). In the ileum, none of the variation was statistically significant amongthe 3 prescriptions (P > 0.05). Chymotrypsin activity was slightly higher in theduodenum and ileum in cattle fed CHMC; however, none of the increases werestatistically significant (P > 0.05). Supplemental CHMC improved the activityof chymotrypsin in the jejunum significantly (P < 0.05). There was no obviousdifference in the activity of chymotrypsin in the jejunum among the differentprescriptions (P > 0.05). It was concluded that CHMC can obviously improvethe activities of pepsin, the activity of trypsin in the jejunum and ileum, and theactivity of chymotrypsin in the jejunum.1643 Sire and dam breed effects on postweaning performance ofpasture-raised meat goat kids. R. Browning Jr.* 1 and M. L. Leite-Browning 2 ,1Tennessee State University, Nashville, TN, USA, 2 Alabama A&M University,Huntsville, AL, USA.Straightbred and reciprocal F 1kids (n = 449) from a complete 3-breed diallel ofBoer (B), Kiko (K), and Spanish (S) were managed from 3 to 6 mo of age across3 yr to assess breed effects on postweaning performance. Kids were weanedin June or August each year and raised on summer pasture with 0.34 kg/d of16% CP supplement. Buck kids remained intact. Growth rate was affected (P= 0.02) by dam breed but not by sire breed (P = 0.99). Kids from Boer damshad lower ADG (52.7 g/d) than those from Kiko and Spanish dams (60.9, 61.4± 3.2 g/d). Weaning class (P = 0.03), kid sex (P < 0.01), and month (P = 0.02)influenced postweaning ADG. Singles has lower ADG than twins (55 vs. 60.9± 2.1 g/d; triplets were intermediate), bucklings had higher ADG than doelings(65.5 vs. 51.4 ± 2.7 g/d), and ADG was higher for June kids than for Augustkids (60.9 vs. 55.5 ± 2.7 g/d). Adjusted 180-d weights were affected by sirebreed (P = 0.05) and dam breed (P < 0.01). Boer- and Kiko-sired kids wereheavier (22.6, 22.6) than Spanish-sired kids (21.6 ± 0.4 kg) and each dam breeddiffered for kid weight (Kiko = 24.1; Spanish = 22.4; Boer = 20.4 kg). Beforecorrection, each wean class differed (P < 0.01) for 180-d kid weight (singles =22.7; twins = 20.2; triplets = 16.9 kg). Kid sex and month each influenced (P