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Reproductive and Productive Performance of Anglo-nubians and Crosses in Mindanao
Thesis Abstract:
Data were collected from SURICO farm in Davao City and Philippine Rural Life Center (PRLC) in Bansalan, Davao del Sur, Philippines to assess the reproductive and productive performance of Anglo-nubians and their crosses.
The overall age at first breeding was 416.2 ± 16.4 days with aq range of 243 to 808 days, while age a first kidding was 570.6 ± 17.3 days with a range of 396 to 961 days. Ages at first breeding and first kidding at SURICO farm were 431.7 days and 603.4 days, respectively. At the PRLC farm, age at first kidding was 558.3 days with an age at first breeding of 411.1 days, which could be the age at first fertile mating. The correlation between birth weight and age at first kidding at SURICO farm was -0.55.
With once a day milking at SURICO farm, the average milk production was 335.5 kg with a lactation length of 248 days, and milk production per day was 1.3 kg with a range of 0.5 to 2.4 kg per day. at PRLC farm, the average milk production was 424.8 kg with lactation length of 230.8 days, and milk production per day was 1.9 kg with a range of 0.8 to 4.5 kg per day. Considering only Anglo-nubians with three lactations, the milk production per day at PRLC was greater (P<0.05) than at SURICO (1.9 kg vs 1.4 kg).
The mean kidding interval at SURICO farm was 338.4 ± 12.7 days with a range of 194 to 708 days. At PRLC farm, the kidding interval was 377.0 + 15.2 days with a range of 208 to 640 days. Most of the kidding intervals at both farms had a range of 181 to 450 days (79.8).
The correlation between lactation length and milk production was from 0.64 to 0.80 (P<0.01). Only lactation length prolonged (P<0.025 and P<0.005) the kidding interval at first and second parties at SURICO farm. At PRLC farm, there was a smaller trend of the effect of lactation length on kidding interval at first and second parties.
Frequency of birth per month at SURICO farm were randomly distributed throughout the year (the highest frequency of birth being in December at 27.5%). There was no indication of seasonal kidding because of a uniform feed availability throughout the year. Sex ratios in both farms were not significantly different.
It was concluded that the first kidding was considerably delayed and kidding intervals were unusually long and variable. Moreover, half native x Anglo-nubian goats had essentially the same milk production as purebred Anglo-nubian.